Regulatory News Announcement

RNS Number:9851W
O2 PLC
16 January 2006


NOTIFICATION OF MAJOR INTERESTS IN SHARES

1. Name of company

O2 plc

2. Name of shareholder having a major interest

Morgan Stanley

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 11 January 2006 Morgan Stanley Securities Limited ('MSSL') disposed of an
interest in the shares with the result that MSSL, and the group companies which
are direct or indirect holding companies of MSSL, no longer hold a notifiable
interest in the shares in accordance with Section 198 on the Companies Act
1985
MSSL is a member of the Morgan Stanley group of companies. Those group companies
which are direct or indirect holding companies of MSSL are, under the terms of
section 203 of the Companies Act 1985, each interested by attribution in any
shares in which MSSL is interested.

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 11 January 2006

11. Date company informed

16 January 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

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

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