Regulatory News Announcement

RNS Number:1590Y
O2 PLC
09 February 2006


NOTIFICATION OF MAJOR INTERESTS IN SHARES

1. Name of company

O2 plc

2. Name of shareholder having a major interest

Credit Suisse

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

In respect of 2 above

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

Material Interest
On 6 February 2006, following disposals, Credit Suisse Securities (Europe)
Limited no longer has a notifiable interest in the shares of O2 plc.

5. Number of shares / amount of stock acquired

Not stated

6. Percentage of issued class

N/A

7. Number of shares / amount of stock disposed

Not stated

8. Percentage of issued class

N/A

9. Class of security

Ordinary shares of 0.1p each

10. Date of transaction

Statement of holdings on 6 February 2006

11. Date company informed

8 February 2006

12. Total holding following this notification

Not stated

13. Total percentage holding of issued class following this notification

N/A

14. Any additional information

Notification in respect of section 198 Companies Act 1985

15. Name of contact and telephone number for queries

Timothy Maw - 01753 628 293

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

Timothy Maw

Date of notification

9 February 2006

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

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