Holding(s) in Company

Costain Group PLC
13 March 2007



TR-1(i): NOTIFICATION OF MAJOR INTERESTS IN SHARES



1. Identity of the issuer or the underlying issuer of existing shares to which
voting rights are attached (ii):

Costain Group PLC



2. Reason for the notification (please state Yes/No): (    )



An acquisition or disposal of voting rights: (   )



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



An event changing the breakdown of voting rights: (    )



Other (please specify): ( Yes  ) Declaration of major shareholding as per FSA
Transitional Provision 7



3. Full name of person(s) subject to the notification obligation (iii):

UEM Builders Berhad



4. Full name of shareholder(s) (if different from 3.) (iv):

N/A



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

N/A



6. Date on which issuer notified:

12 March 2007



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

35%



8. Notified details:





A: Voting rights attached to shares


Class/type of shares if possible           Situation previous to the Triggering transaction (vi)
using the ISIN CODE
                                  Number of shares                   Number of voting Rights (viii)


GB0002272184                      N/A                                N/A





Resulting situation after the triggering transaction (vii)


Class/type of shares if      Number of shares         Number of voting rights (ix)      % of voting rights
possible using the ISIN CODE
                             Direct                   Direct (x)   Indirect (xi)        Direct      Indirect


                             0                        0            125,354,541          0           35



B: Financial Instruments

Resulting situation after the triggering transaction (xii)


Type of         Expiration Date       Exercise/Conversion       Number of voting rights     % of voting rights
financial       (xiii)                Period/ Date (xiv)        that may be acquired if the
instrument                                                      instrument is exercised/
                                                                converted.








Total (A+B)
Number of voting rights        % of voting rights


125,354,541                    35



9. Chain of controlled undertakings through which the voting rights and/or the
financial instruments are effectively held, if applicable (xv):

UEM Builders Berhad owns 93 per cent. of Daedalus Projects Limited which holds
125,354,541 shares in Costain Group PLC.  42,500,000 shares are registered in
the name of Daedalus Projects Limited, and a further 82,854,541 shares are
registered in the name of Daedalus Projects Limited's nominee, Rood Nominees
Limited.





Proxy Voting:



10. Name of the 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 number:

0060327189990





Annex to Notification Of Major Interests In Shares (xvi)



A: Identity of the person or legal entity subject to the notification obligation



Full name (including legal form for legal entities):

Sharifah Shafiqa Salim



Contact address (registered office for legal entities):

UEM Builders Berhad, First Floor, MCOBA Building, Jalan Syed Putra, 50460 Kuala
Lumpur, Malaysia



Phone number:

0060327189990



Other useful information (at least legal representative for legal persons):

Joint Company Secretary of UEM Builders Berhad, parent company of Daedalus
Projects Limited.




                      This information is provided by RNS
            The company news service from the London Stock Exchange