Exhibit 5

                           [Letterhead of Macfarlanes]

The Directors
Cordiant Communications Group plc
121-141 Westbourne Terrace
London
W2 6JR
                                                     Our Ref:     MHL/WD/555974
                                                     Direct Line: 020 7849 2539
                                                     E-mail: mhl@macfarlanes.com

5 September 2000



Dear Sirs

Registration Statement on Form S-8

As English  solicitors for Cordiant  Communications  Group plc, a public limited
company  incorporated  under the laws of England and Wales ("the  Company"),  we
have been  requested  to render this  opinion in  connection  with the  proposed
registration  under the United  States  Securities  Act 1933,  as amended  ("the
Securities  Act"),  of Ordinary Shares of 50p each in the capital of the Company
("the  Ordinary  Shares") to be issued on exercise of options  granted under the
Lighthouse  Global  Network,  Inc. 1999 Stock  Incentive Plan and the Lighthouse
Global Network,  Inc. 2000 Stock  Incentive Plan ("the Plans"),  pursuant to the
Company's  Registration  Statement  on Form S-8  filed by the  Company  with the
Securities and Exchange  Commission under the Securities Act with respect to the
registration  of Ordinary  Shares for issue under the Plan and the Agreement and
Plan of  Merger  dated  as of July  4,  2000  made  by and  among  the  Company,
Lighthouse Acquisition,  Inc., a wholly-owned subsidiary of the Company ("Merger
Sub") and  Lighthouse  Global  Network,  Inc.  ("Lighthouse"),  as amended by an
Amendment  Agreement dated as of September 5 , 2000 among the same parties ("the
Merger  Agreement"),  providing  for the  merger  of  Merger  Sub  with and into
Lighthouse.

1                 For the  purpose  of this  opinion  we have  examined  copies,
                  certified or otherwise authenticated to our satisfaction, of:-

1.1               the  Certificate  of  Incorporation  and each  Certificate  of
                  Incorporation on change of name of the Company;

1.2               the Memorandum of  Association  and Articles of Association of
                  the Company;

1.3               the Merger Agreement and the Plans; and

1.4               such records of  proceedings  of the Board of Directors of the
                  Company, records of public officials and other documents as we
                  have deemed necessary or appropriate under the circumstances.

                  We  have  assumed  the  genuineness  of  all  signatures,  the
                  authenticity of all documents submitted to us as originals and
                  the conformity to the originals of all documents  submitted to
                  us as copies.

2                 On the basis of and  subject to the  foregoing,  we are of the
                  opinion that the Ordinary Shares will, when issued pursuant to
                  and in accordance with the Plans and the Merger Agreement,  be
                  legally  and  validly  issued,  fully paid and  non-assessable
                  (i.e.,  no further  contribution  in  respect of the  Ordinary
                  Shares  will be  required  to be made  to the  Company  by the
                  holders thereof, by reason only of their being such holders).

This  opinion is limited to the law of England and Wales as  currently in effect
and applied by the courts  thereof  and is given on the basis that this  opinion
will be governed by and construed in accordance with such law.

We  consent to the  filing of this  opinion  as an  exhibit to the  Registration
Statement.  In giving such consent,  we do not admit that we are in the category
of persons whose consent is required under Section 7 of the Securities Act.

Yours faithfully

/s/Macfarlanes
- -----------------------