Holding(s) in Company

Slough Estates PLC
19 March 2004



The Company Secretary
Slough Estates plc
234 Bath Road                             Direct Line: 01603 843362
SLOUGH                                    Fax: [phone]
SL1 4EE                                   Our Ref:   GRU/AC


                                             18 March 2004

Dear Sir

SLOUGH ESTATES PLC (the 'Company') - SEDOL 0814104

This notification supersedes our previous notification to you dated 26 August
2003 and is prompted by sales totalling 773,000 on 17 March 2004.

This notification relates to issued ordinary shares of GBP0.10 each in the
capital of the Company (the 'shares') and is given in fulfilment of the
obligations imposed by sections 198 to 202 of the Companies Act 1985 (the
'Act').

1.  Notification on behalf of Morley Fund Management Limited (a subsidiary of
Aviva plc).

1.1    Morley Fund Management Limited no longer have a notifiable
interest in the shares.

2.     Notification on behalf of Aviva plc.

2.1    Aviva plc no longer have a notifiable interest in the shares.

We are only required to notify interests which are defined as material interests
when the holding is equal to 3% or more of the Company's relevant share capital.
The term material interests exclude certain categories where we do not hold a
beneficial interest, for example where the shares are held in an Authorised Unit
Trust Scheme or Open Ended Investment Company. Holdings in those categories are
therefore not included in the holding notified under this letter. If you wish us
to confirm the level of holdings in these categories, please let us know.

Yours faithfully



Abby Condick
For and on behalf of
Aviva plc


The Company Secretary
Slough Estates plc                                   18 March 2004



APPENDIX: MORLEY FUND MANAGEMENT LIMITED

REGISTERED HOLDER                        NUMBER OF SHARES HELD

BNY Norwich Union Nominees Ltd           4,324,265          (Material)

Chase GA Group Nominees Ltd              3,048,908          (Material)

Chase Nominees Ltd                         830,000          (Material)

BT Globenet Nominees Ltd                    11,700          (Material)

CUIM Nominee Ltd                         3,577,080          (Material)

RBSTB Nominees Ltd                         475,000          (Material)



Total Percentage Interest of MORLEY FUND Management Limited: 2.94%
Issued Share Capital on Which This Notification is Based: 417,859,627


The Company Secretary
Slough Estates plc
                                    18 March 2004







APPENDIX: Aviva plc

Registered HOLDERS                        NUMBER OF SHARES HELD

BNY Norwich Union Nominees Ltd            4,324,265          (Material)

Chase GA Group Nominees Ltd               3,048,908          (Material)

Chase Nominees Ltd                          830,000          (Material)

BT Globenet Nominees Ltd                     11,700          (Material)

CUIM Nominee Ltd                          3,577,080          (Material)

RBSTB Nominees Ltd                          475,000          (Material)



Total Percentage Interest of Aviva PLC: 2.94%

Issued Share Capital on Which This Notification is Based: 417,859,627






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