EXHIBIT 5.1

                                                Allen & Overy LLP
                                                One Bishops Square
WPP Group plc                                   London E1 6AO United Kingdom
27 Farm Street
London                                          Tel: +44 (0)20 3088 0000
W1J 5RJ                                         Fax: +44 (0)20 3088 0088
United Kingdom
Our ref               16432-00481 CO:6202856.5

31 July 2007

Dear Sirs,

Registration Statement on Form S-8 of WPP Group plc (the Registration Statement)

1.   You have  requested  the opinion of Allen & Overy LLP (A&O) with respect to
     certain  matters  of  English  law in  relation  to shares of WPP Group plc
     (WPP), in connection with the proposed registration under the United States
     Securities Act of 1933, as amended,  of 4,824,238 of WPP's ordinary  shares
     of 10 pence  each (the  Ordinary  Shares)  in  respect  of awards  over the
     Ordinary  Shares that have been  granted  under the 24/7 Media,  Inc.  1998
     Stock  Incentive  Plan, the 24/7 Media,  Inc. 2001 Stock Incentive Plan for
     Non-Officers  and the 24/7 Real  Media,  Inc.  2002  Stock  Incentive  Plan
     (together the Plans). The proposed  registration of Ordinary Shares follows
     the  merger  (the  Merger)  of  24/7  Real  Media,   Inc.  (24/7)  with  TS
     Transaction,  Inc., a wholly owned subsidiary of WPP (the Transaction).  We
     understand  that  certain of the  Ordinary  Shares will be newly issued and
     allotted at the relevant time and that certain of the Ordinary  Shares (the
     ESOP  Shares) will be  transferred  by the trustees of the WPP Group Plc UK
     ESOP,  the WPP  Group  Plc  Grantor  Trust  or the WPP  Group  Plc ROW ESOP
     (together, the WPP ESOPs).

2.   In connection with this opinion we have examined copies of:

     (a)  the memorandum and articles of association of WPP (the  Memorandum and
          Articles);

     (b)  the rules of each of the Plans (the Rules); and

     (c)  the  ordinary  and special  resolutions  of WPP passed on 26 June 2007
          (the Shareholder Resolutions).

3.   Except as stated above, we have not examined any contracts,  instruments or
     other  documents  entered into or affecting WPP or the  Transaction  or any
     corporate  records of WPP and have not made any other enquiries  concerning
     WPP or the Transaction.

4.   Our opinion is confined  solely to the laws of England in force at the date
     of this  opinion and is governed  by, and  construed  in  accordance  with,
     English law.  Accordingly,  we express no opinion with regard to any system
     of law other than the laws of England as  currently  applied by the English
     courts. In particular,  we express no opinion on European  Community law as
     it  affects  a  jurisdiction  other  than  England  and  we  have  made  no
     investigation  of the laws of any  other  jurisdiction  including,  without
     limitation,  the federal laws of the United States of America and we do not
     express or imply any opinion on such laws.

5.   We have assumed, without further enquiry, that:

     (a)  insofar as any  obligation  falls to be performed in any  jurisdiction
          outside England, its performance will not be illegal or ineffective by
          virtue  of the laws of that  jurisdiction  and will  not  violate  the
          public policy of any jurisdiction;

     (b)  all signatures on the executed  documents  which,  or copies  (whether
          photocopies,  certified copies, facsimile copies or electronic copies)
          of which, we have examined are genuine and that such copies conform to
          the original documents executed;

     (c)  all  documents  submitted  to us as  originals  and upon which we have
          sought to rely are  genuine  and  complete  and none of the  documents
          furnished to us has been amended, supplemented or terminated;

     (d)  no law of any jurisdiction other than England affects our conclusions;

     (e)  all  statements  made to us and all facts stated in any documents upon
          which we have sought to rely are true and correct;

     (f)  the Memorandum and Articles which we have examined are those in force;


     (g)  the Rules  that we have  examined  are those in force,  were  properly
          adopted by 24/7 and have been and will be operated in accordance  with
          their terms, as amended to reflect the Transaction;

     (h)  the terms of the Merger are  effective  to confer the right to receive
          American Depositary Shares representing  Ordinary Shares on holders of
          outstanding but unvested options to purchase shares of common stock of
          24/7 under the Plans, on exercise of such options, as described in the
          Registration Statement;

     (i)  the  general  meeting  of  the   shareholders  of  WPP  at  which  the
          Shareholder  Resolutions  were passed was duly  convened  and held and
          that  the  Shareholder  Resolutions  were  passed  in the  form of the
          resolutions   contained   in  the  notice  of  such  meeting  and  the
          Shareholder  Resolutions  have not  been and will not be  subsequently
          amended, modified or revoked before the allotment and issue of any new
          Ordinary Shares;

     (j)  at the time of the issue of any new Ordinary  Shares,  WPP will have a
          nominal amount of authorised but unissued  Ordinary Shares of 10 pence
          each at least equal to the nominal amount of such new Ordinary Shares;

     (k)  at the time of the  issue of any new  Ordinary  Shares,  the  board of
          directors will have  sufficient  authority to: (i) allot the number of
          new Ordinary Shares being issued;  and (ii) to allot the number of new
          Ordinary  Shares  being issued as if section 89 of the  Companies  Act
          1985 did not apply;

     (l)  any new Ordinary  Shares will when issued be subscribed  for under the
          Plans wholly in cash at not less than their nominal value;

     (m)  admission of any new Ordinary  Shares to the Official List  maintained
          by the Financial Services Authority and to trading on the London Stock
          Exchange plc will become  effective in accordance  with the applicable
          rules  of the  Financial  Services  Authority  and  the  London  Stock
          Exchange plc;

     (n)  a meeting of the board of  directors of WPP or a duly  authorised  and
          constituted  committee  of the board of  directors  of WPP has been or
          will be duly  convened and held at which it was or will be resolved to
          allot and issue any new Ordinary Shares.


                                       2                            31 July 2007


6.   On the basis of the foregoing,  and having regard to such considerations of
     English  law in force at the date of this  letter as we deem  relevant  and
     subject  as set out  below,  we are of the  opinion  that the new  Ordinary
     Shares to be registered by WPP will,  when issued by WPP in connection with
     the  Plans,  be  validly  issued,  credited  as fully  paid and no  further
     contributions  in respect of them will be required to be made to WPP by the
     holders of them, by reason of their being such holders.

7.   This  opinion  is  subject to the  qualifications  set out  below:

     (a)  the opinions set out above are subject to all  applicable  limitations
          arising  from  the  laws  of  bankruptcy,   insolvency,   liquidation,
          administration,  reorganisation, moratorium, reconstruction or similar
          laws and general  principles  of law affecting the rights of creditors
          generally;

     (b)  the  effectiveness  of terms  exculpating  a party from a liability or
          duty otherwise owed is limited by English law; and

     (c)  equitable  remedies such as an order for specific  performance  or the
          issue of an  injunction,  are available  only at the discretion of the
          court and certain  obligations may result in a claim for damages only,
          as opposed to specific performance.

This opinion is addressed to you solely for your own purpose in connection  with
the  Registration  Statement  and may not be used or  relied  upon by any  other
person or for any other  purposes  without  A&O's  prior  written  consent.  A&O
consents  in  relation  to the  filing  of  this  letter  as an  exhibit  to the
Registration  Statement. In giving such consent A&O does not admit that it comes
within the category of persons whose consent is required  under section 7 of the
United States Securities Act of 1933, as amended.

Yours faithfully,

/s/ Allen & Overy LLP

Allen & Overy LLP


                                       3                            31 July 2007