The Royal Bank of Scotland plc is registered in Scotland No 90312
           Registered Office: 36 St Andrew Square, Edinburgh EH2 2YB
   Agency agreements exist between members of The Royal Bank of Scotland Group
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THIS IS AN  IMPORTANT  LETTER  WHICH SETS OUT THE TERMS AND  CONDITIONS  OF YOUR
GROUP OVERDRAFT  FACILITY.  PLEASE NOTE THAT OVERDRAFTS ARE REPAYABLE ON DEMAND.
WE  RECOMMEND  THAT YOU TAKE  INDEPENDENT  LEGAL  ADVICE IF YOU HAVE ANY  DOUBTS
REGARDING THE TERMS AND CONDITIONS OF THE FACILITY.
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                                                      The Royal Bank of Scotland
                                                         Solent Corporate Centre
Date: 6th March 2006              Address: 3 Hampshire Business Park, PO Box 462
                                                    Templars Way, Chandlers Ford
                                                                  Hants SO53 3RY
Private & Confidential                           Telephone:       023 8024 2163
- ----------------------

Vicon Industries Limited
Company Number 1551194
Brunel Way,
Segensworth East,
Fareham,
Hampshire,
PO15 5TX




Dear Sirs


Multi-Currency Overdraft Facility
Account Holding Branch/Office:
Portsmouth Commercial Road Branch (sorting code 56 00 64)

I write to advise the terms and conditions upon which The Royal Bank of Scotland
plc ("RBS") acting as agent for National Westminster Bank Plc is willing to make
available  to you a  multi-currency  overdraft  facility for the purpose of your
business.

1    Definitions

1.1  In  this  letter  the  following   expressions  shall  have  the  following
     meanings:-

     "Bank" means National  Westminster Bank Plc, which is the lender under this
     letter, and the "Bank" means its successors and assigns;

     "euro" means the single currency  adopted or to be adopted by participating
     member states under the Treaty establishing the European Union;

     "Facility" means the multi-currency overdraft facility made available or to
     be made available on the terms and conditions set out in this letter;

     "Facility  Accounts"  means the  Sterling  Current  Account and the Foreign
     Currency Current Account;

     "Facility Limit" means (pound)1,000,000;

     "Foreign Currency Accounts" means the Foreign Currency Creditor Account and
     the Foreign Currency Current Account;

     "Foreign  Currency" means any  non-Sterling  currency  (including the euro)
     which is freely  convertible  into  Sterling  and readily  available in the
     London Interbank Market;

     "Foreign Currency  Creditor Account" means the deposit account  denominated
     in United States  Dollars  referenced  140-01-06101445  (or as amended from
     time to time pursuant to Clause 12.5);

     "Foreign Currency Current Account" means the current account denominated in
     euros referenced  550-00-06854451 (or as amended from time to time pursuant
     to Clause 12.5) on which the Facility is made available;



     "Sterling" means the lawful  currency of the United Kingdom;

     "Sterling  Current  Account"  means  the  current  account  denominated  in
     Sterling on which the Facility is made available, referenced account number
     01144642 (or as amended from time to time pursuant to Clause 12.5); and

     "United  States  Dollars" and "US$" mean the lawful  currency of the United
     States of America.

Overdraft Limit(s) and Utilisation

1.2  The Facility may be utilised by overdrawing the Facility Accounts up to the
     Facility Limit. The Facility Limit must not at any time be exceeded.

1.3  For the purpose of calculating utilisation of the Facility:-

     (a)  any credit  balances on the Foreign  Currency  Accounts will be netted
          against any debit balance on the Foreign Currency Accounts in the same
          Foreign Currency; then

     (b)  the Sterling  equivalent  of the net balances on the Foreign  Currency
          Accounts  shall be  calculated by reference to the  prevailing  market
          rate of exchange; and then

     (c)  the Sterling  equivalent  of the net balances on the Foreign  Currency
          Accounts will be netted  against (or  aggregated  with) the balance on
          the Sterling Current Account.

1.4  The Bank may  decline  to pay a cheque  (or  allow  any  other  payment  or
     withdrawal)  from a Facility  Account  (whether  in credit or debit)  which
     would result in the Facility Limit being exceeded.

1.5  If the Bank does pay a cheque (or allows any other  payment or  withdrawal)
     resulting  in the Facility  Limit being  exceeded it will not mean that the
     Facility  Limit has  changed  or that the Bank will  agree to pay any other
     cheque (or allow any other  payment or  withdrawal)  which  would have that
     effect.

1.6  The  Bank  may  disregard  any  uncleared   credits  for  the  purposes  of
     calculating the utilisation of the Facility (and any interest payable).  If
     however  the  Bank  does pay a cheque  (or  allows  any  other  payment  or
     withdrawal)  against  uncleared credits this does not mean that it is bound
     to do so at other times.

Creditor Account

The Foreign  Currency  Creditor Account should remain in credit at all times and
the Bank may decline to pay a cheque (or allow any other payment or  withdrawal)
which could result in a cleared  debtor  balance.  If the Bank does pay a cheque
(or  allows any other  payment  or  withdrawal)  resulting  in a cleared  debtor
balance it will not mean that a borrowing  facility has been established or that
the Bank will  agree to pay any other  cheque  (or  allow any other  payment  or
withdrawal) which would have the same effect. 2 Preconditions

2.1  The Bank  will not be  obliged  to make the  Facility  available  until the
     following conditions have been met:-

     (a)  any  security  required  in terms of Clause 9 of this  letter has been
          valued and completed to the Bank's satisfaction; and

     (b)  you have accepted the Facility on the terms and  conditions set out in
          this  letter  by  returning  the  duplicate  of this  letter  with the
          acknowledgement  duly  signed,  within  28  days  of the  date of this
          letter.

3    Availability

3.1  The Facility is repayable  upon demand in  accordance  with normal  banking
     practice and the Facility can be  unconditionally  cancelled by the Bank at
     any time.

3.2  Subject  to the  Bank's  rights  under  Clause  5.1  the  Facility  will be
     available until  notification to you by the Bank of its intention to cancel
     the Facility.  Without prejudice to the Bank's rights under this Clause the
     Facility will be subject to review on at least an annual basis.

3.3  The  Bank  will  always  give  notification  of its  intention  to  place a
     restriction on your ability to make drawings on the Facility.

3.4  You may at any time  advise us in writing  that the  Facility  is no longer
     required.



4    Set Off, Retention and Appropriation

4.1  In  addition  to any other  rights to which it may be  entitled,  including
     rights under any  guarantee or  security,  the Bank may retain,  set off or
     appropriate any credit balances  (whether current or not yet due) either on
     the Facility  Accounts,  the Foreign Currency Creditor Account or any other
     accounts you may have with the Bank against any debit  balances on any such
     accounts, or any other obligations you may owe to the Bank whether present,
     future, actual or contingent.

4.2  The Bank may exercise any of these rights  without prior notice both before
     and after  demand  and in so doing may,  where  required,  convert  between
     currencies at the prevailing market rate of exchange.

5    Interest

Sterling Current Account

5.1  Interest  will be  charged  separately  by the Bank on the  cleared  debtor
     balance of the Sterling Current Account as follows:-

     (a)  for borrowing up to the Facility  Limit, at a rate which is equivalent
          to 1.5% per annum over the Bank's Sterling Base Rate; and

     (b)  for  borrowing  in excess of the  Facility  Limit,  at a rate which is
          equivalent to 4.5% per annum over the Bank's Sterling Base Rate.

          The Bank's Sterling Base Rate as at 2nd March 2006 was 4.5% per annum.
          Changes to the Bank's  Sterling  Base Rate may be made at any time and
          with  immediate  effect,  such changes  being  advised by way of press
          notice.

5.2  Such interest will be  calculated  both before and after demand,  decree or
     judgement  on a daily  basis and a year of 365 days and debited by the Bank
     to the Sterling  Current  Account  quarterly  on the final  business day of
     March,  June,  September  and December (or such other dates as the Bank may
     advise from time to time).

Foreign Currency Current Account

5.3  Interest on any debtor balance on the Foreign Currency Current Account will
     be  charged at 1.5% per annum over the  Bank's  relevant  Currency  Lending
     Rate.  The Bank's  Currency  Lending Rates are variable and will  therefore
     change from time to time.

5.4  Such interest will be calculated on the Foreign  Currency  Current  Account
     both before and after  demand,  judgement  or decree on a daily basis and a
     year of 360 days (or such other period as reflects market convention in the
     relevant  currency)  and shall be debited to the Foreign  Currency  Current
     Account quarterly on the first business day of March,  June,  September and
     December.

6 Costs

6.1  An  arrangement  fee of  (pound)1,850  is  payable  and will be  debited to
     Sterling  Current Account  01144642  following  receipt by the Bank of your
     acceptance  of the terms and  conditions of the Facility as set out in this
     letter or following your first  utilisation  of the Facility,  whichever is
     the earlier.  You will also be responsible for paying any costs incurred by
     the  Bank in  connection  with the  Facility  whether  as a  result  of you
     breaking  the terms of the  Facility or not.  These costs will include (but
     not be limited to) costs of taking and  discharging  any  security;  taking
     steps,  including  court  action,  to  obtain  payment;   enforcing  and/or
     preserving  the Bank's  rights  under any security  held for the  Facility;
     tracing you if you change address without notice and communicating with you
     if you break the terms of the  Facility.  If such costs remain  unpaid then
     they may be  debited  by the Bank to any of the  Facility  Accounts  or the
     Foreign Currency Creditor Account.

6.2  Further  fees  will be  payable  from time to time in  respect  of the Bank
     reviewing the operation  and ongoing  availability  of the Facility and you
     will be  advised  by the Bank at least 14 days in  advance  of any such fee
     being payable.

7 Security

7.1  The Facility will be secured by the following:-

     (a)  the existing available security held by the Bank as follows:-

          (i)  a Debenture by you;

          (ii) a first  Legal  Charge  over  Site P3,  Brunel  Way,  Segensworth
               Industrial  Estate,  Segensworth  East,  Fareham PO15 5TX and its
               associated assets; and

     (b)  all further available security which the Bank may in future obtain.



7.2  Any additional  security will require to be granted in the Bank's preferred
     form.  The value of the security will be reviewed  regularly  and,  without
     prejudice to its overriding right to call for repayment on demand, the Bank
     may seek additional security if there is a significant drop in the value of
     the security held.

8 Financial Information

8.1 To enable the Bank to monitor the Facility you will provide:-

     (a)  as soon as they  become  available  but in any event  within  180 days
          after  the  end  of  your  financial  year,  your  audited   financial
          statements and the audited  financial  statements of any company which
          is or becomes your subsidiary within the meaning of Section 736 of the
          Companies Act 1985 for that year;

     (b)  as soon as they become available but in any event within 21 days after
          the end of the  financial  period to which they relate and in a format
          acceptable to the Bank, your monthly management accounts incorporating
          balance  sheet,  profit and loss  account and aged list of debtors and
          creditors (the "Management Accounts");

     (c)  promptly,  all  notices  or  other  documents  sent  by  you  to  your
          shareholders and/or creditors; and

     (d)  promptly,  such further information regarding your financial condition
          and operations as the Bank may reasonably request.

8.2  All accounts and other financial  information  provided to the Bank will be
     prepared  consistently and in accordance with generally accepted accounting
     standards.

9 Financial Performance

9.1  The  financial   statements  and   Management   Accounts  will  require  to
     demonstrate  that on the last day of the  period  covered  by the  relevant
     statements/accounts:-

     (a)  Overdraft  Utilisation  was not  more  than  40% of the  aggregate  of
          Debtors and Stock less all sums due to preferential creditors; and

     (b)  Overdraft Utilisation was not more than 66% Debtors

          failing which,  without  prejudice to the Bank's  overriding  right to
          call for repayment on demand,  the Bank, after due notice,  may amend,
          restrict or withdraw the Facility.

9.2  For the purpose of this Clause the following definitions shall apply:-

          "Debtors" means the value of your trade debtors aged less than 90 days
          excluding,  as determined by the Bank (a) inter company  debtors,  (b)
          debtors who are also  creditors and (c) debtors in dispute or known to
          be doubtful.

          "Overdraft  Utilisation"  means the  utilisation  of the  facility  as
          calculated  pursuant  to Clause 2.2 as at the close of business on the
          final business day of the period  covered by the financial  statements
          or Management Accounts.

          "Stock"  means the value of trade  stock (at the lower of cost and net
          realisable  value)  excluding (a) obsolete stock, (b) work in progress
          and (c) such other stock as the Bank may reasonably decide to exclude.

10 Miscellaneous

10.1 The Bank may debit any of the  Facility  Accounts  in  accordance  with the
     terms of Clauses 7 and 8 of this letter even if it results in the  Facility
     Limit being exceeded.

10.2 These  terms and  conditions  will not be affected in any way by any of the
     Facility  Accounts or the Foreign Currency Creditor Account being allocated
     another  account  number/reference  by the  Bank or  being  transferred  to
     another branch, office or department of the Bank.

10.3 The Bank may change any of these terms and conditions by giving at least 30
     days' written notice to you.

10.4 In the event of the Bank  demanding  repayment  of the Facility in terms of
     Clause 5 of this letter:-

     (a)  subject to  Sub-Clause  12.4(c)  below,  you will require to repay any
          debtor  balance  on  the  Foreign  Currency  Accounts  in  immediately
          available funds of the relevant  Foreign Currency (or such other funds
          as may  for  the  time  being  be  customary  for  the  settlement  of
          international banking transactions in such Foreign Currency);



     (b)  all payments  under the  Facility  will require to be made without set
          off or  counterclaim  and free and clear of any deduction,  whether of
          present or future taxes,  stamp duty or other  charges  unless you are
          required  by law to make such  payment  subject  to any  deduction  or
          withholding  in which case the  relevant  payment  will  require to be
          increased to the extent  necessary to ensure that the Bank  receives a
          sum equal to the sum  which it would  have  received  had you not been
          required to make such a deduction or withholding;

     (c)  the Bank reserves the right,  at any time after the serving of demand,
          to convert any balance on the Foreign Currency Accounts (together with
          any accrued  interest  and unpaid  costs,  charges,  fees and expenses
          denominated in Foreign  Currency) to Sterling at the prevailing market
          rate of exchange and pass a  corresponding  debit against the Sterling
          Current Account.

10.5 Any requests for the addition of Facility  Accounts and/or Foreign Currency
     Creditor  Accounts  to the  Facility  must be in  writing  (in the  case of
     Foreign Currency Accounts,  using the relevant application form required by
     the Bank),  will be at the  Bank's  sole  discretion  and may be subject to
     these  terms  and  conditions   being   suitably   amended  to  the  Bank's
     satisfaction.

10.6 RBS may act as agent for the Bank in connection with the  administration of
     the Facility.

Please  indicate  acceptance of the above terms and  conditions by arranging for
the acknowledgement on the duplicate of this letter to be signed and returned to
me.  The  Bank  will  not  be  obliged  to  provide  the   Facility   until  the
acknowledgement on the duplicate of this letter has been returned duly signed.

The Bank may,  at its  option,  treat any usage of the  Facility  as  acceptance
(without amendment) of the terms and conditions of this letter.

Please do not hesitate to contact me if you require clarification of any of the
above terms and conditions.


Yours faithfully

For and on behalf of RBS acting as agent for the Bank




/s/ Neil Holloway
- -------------------------------------------
Neil Holloway
Relationship Director


Having decided that the proposed Facility is appropriate and in the interests of
Vicon Industries Limited, the Facility is hereby accepted on the above terms and
conditions.

For and on behalf of Vicon Industries Limited



              /s/ Christopher J. Wall
Signature/s   ..........................         Date/s ........................



              ..........................                ........................


59246/CCD/SC/NWSOCO