Interest in Shares

Costain Group PLC
03 January 2008


TR-1: Notifications of Major Interests in Shares




1. Identity of the issuer or the underlying issuer of         Costain Group PLC
existing shares to which voting rights are attached:


2. Reason for notification (yes/no)
                                                                                        NO

An acquisition or disposal of voting rights
                                                                                        NO

An acquisition or disposal of financial instruments which may result in the acquisition
of shares already issued to which voting rights are attached
                                                                                        YES

An event changing the breakdown of voting rights
                                                                                        NO

Other (please specify):______________
                                                     UEM Builders Berhad

3. Full name of person(s) subject to notification
obligation:
                                                     Rood Nominees Limited

4. Full name of shareholder(s) (if different from
3):
                                                     31 December 2007

5. Date of transaction (and date on which the
threshold is crossed or reached if different):
                                                     3 January 2008

6. Date on which issuer notified:
                                                     21%

7. Threshold(s) that is/are crossed or reached:






8: Notified Details
A: Voting rights attached to shares


Class/type of      Situation previous to the  Resulting situation after the triggering transaction
shares             triggering transaction
                   Number of       Number of  Number of   Number of voting rights Percentage of
If possible use    shares          voting     shares                              voting rights
ISIN code                          rights

                                                          Direct   Indirect       Direct   Indirect
GB0002272184       138,108,505     21         0           0        138,108,505    0        21


B: Financial Instruments


Resulting situation after the triggering transaction


Type of financial    Expiration date      Exercise/ conversion No. of voting rights  Percentage of voting
instrument                                period/date          that may be acquired  rights
                                                               (if the instrument
                                                               exercised/converted)
-






Total (A+B)


Number of voting rights                              Percentage of voting rights
138,108,505                                          21




9. Chain of controlled undertakings through which the voting rights and /or the financial instruments are effectively
held, if applicable:
UEM Builders Berhad owns 93 per cent. of Daedalus Projects Limited which holds 138,108,505 shares in Costain Group PLC.
  These shares are registered in the name of Daedalus Projects Limited's nominee, Rood Nominees Limited.


Proxy Voting:


10. Name of proxy holder:


11. Number of voting rights proxy holder will cease
to hold:


12. Date on which proxy holder will cease to hold
voting rights:




13. Additional information:


14 Contact name:                                       Sharifah Shafiqa Salim


15. Contact telephone name:                            0060327189990








Note: Annex should only be submitted to the FSA not the issuer


Annex: Notification of major interests in shares




A: Identity of the person or legal entity subject to the notification obligation
Full name (including legal form for legal         Sharifah Shafiqa Salim
entities)
Contact address (registered office for legal      UEM Builders Berhad, First Floor, MCOBA Building,
entities)                                         Jalan Syed Putra, 50460 Kuala Lumpur, Malaysia
Phone number                                      0060327189990
Other useful information (at least legal          Joint Company Secretary of UEM Builders Berhad,
representative for legal persons)                 parent company of Daedalus Projects Limited.
A: Identity of the persons or legal entity subject to the notification obligation
Full name

(including legal form of legal entities)


Contact address

(registered office for legal entities)


Phone number & email


Other useful information

(at least legal representative for legal persons)




B: Identity of the notifier, if applicable
Full name


Contact address


Phone number & email


Other useful information



(e.g. functional relationship with the person or
legal entity subject to the notification obligation)


C: Additional information







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