Major interests in shares

Costain Group PLC
23 March 2005


Costain Group PLC

Schedule 10
Notification of major interests in shares


1. Name of company

Costain Group PLC


2. Name of shareholder having a major interest

Lloyds TSB Group Plc and its subsidiaries


3. Please state whether notification indicates that it is in respect of holding
of the shareholder named in 2 above or in respect of a non-beneficial interest
or in the case of an individual holder if it is a holding of that person's
spouse or children under the age of 18

Notification indicates that it is in respect of holding of the Shareholder in 2
above


4. Name of the registered holder(s) and, if more than one holder, the number of
shares held by each of them

Euroclear Nominees Limited 10,648,000 ordinary shares
Ranelagh Nominees Limited 7,999,990 ordinary shares


5. Number of shares / amount of stock acquired

N/A


6. Percentage of issued class

N/A


7. Number of shares / amount of stock disposed

18,647,990


8. Percentage of issued class

5.28%


9. Class of security

Ordinary Shares


10. Date of transaction

18 March 2005


11. Date company informed

21 March 2005


12. Total holding following this notification

NIL


13. Total percentage holding of issued class following this notification

NIL


14. Any additional information

None


15. Name of contact and telephone number for queries

Clive L Franks - 01628 842 575


16. Name and signature of authorised company official responsible for making
this notification

Clive L Franks, Company Secretary


Date of notification

23 March 2005


The FSA does not give any express or implied warranty as to the accuracy of this
document or material and does not accept any liability for error or omission.
The FSA is not liable for any damages (including, without limitation, damages
for loss of business or loss of profits) arising in contract, tort or otherwise
from the use of or inability to use this document, or any material contained in
it, or from any action or decision taken as a result of using this document or
any such material.




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