Rule 8.3- O2 plc

Aviva PLC
03 November 2005

                                                                        FORM 8.3

   DEALINGS BY PERSONS WHO OWN OR CONTROL 1% OR MORE OF ANY CLASS OF RELEVANT
                                    SECURITY

              (Rule 8.3 of The City Code on Takeovers and Mergers)


Name of purchaser/vendor *                         AVIVA PLC AND ITS SUBSIDIARIES

Company dealt in                                   O2 PLC

Relevant security dealt in                         ORD GBP0.001

If a connected EFM, name of offeree/offeror with   N/A
which connected

If a connected EFM, nature of connection #         N/A

Date of dealing                                    02 NOVEMBER 2005


DEALINGS +

Amount bought                                      Price per unit (currency must be stated)

1,000                                              GBP1.977500



Amount sold                                        Price per unit (currency must be stated)

20,000,000                                         GBP1.980625



Resultant total amount and percentage of the same  181,085,705 (2.066%)
relevant security owned or controlled


IS A SUPPLEMENTAL FORM 8 (DERIVATIVE)/FORM 8 (OPTION) ATTACHED? NO


Date of disclosure                                 03 NOVEMBER 2005

Contact name                                       NEIL WHITTAKER

Telephone number                                   01603 684420

*          Specify the owner or controller in addition to the person dealing.
The naming of nominees or vehicle companies is insufficient. In the case of
disclosure of dealings by fund managers on behalf of discretionary clients, the
clients need not be named.

#          See the definition of 'connected fund managers and principal traders'
in the Definitions Section of the Code.

+          If disclosing dealings/holdings in derivatives or options, please
attach Supplemental Form 8 (Derivative) or Supplemental Form 8 (Option), as
appropriate.

For details of the Code's dealing disclosure requirements, see Rule 8 and its
Notes which can be viewed on the Takeover Panel's website at
www.thetakeoverpanel.org.uk.


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