Holding(s) in Company

RNS Number:3577Q
Aggregate Industries PLC
30 September 2003


                           SCHEDULE 10
 
             NOTIFICATION OF MAJOR INTERESTS IN SHARES


1)   NAME OF COMPANY
     AGGREGATE INDUSTRIES PLC


2)   NAME OF SHAREHOLDER HAVING A MAJOR INTEREST
     SCHRODER INVESTMENT MANAGEMENT LIMITED


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
     PLEASE SEE CORRESPONDENCE BELOW


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


5)   Number of shares/amount of stock acquired.
     -


6)   Percentage of issued Class
     -

7)   Number of shares/amount of stock disposed
     14,732,989

8)   Percentage of issued Class
     1.15%

9)   Class of security
     ORDINARY 25P SHARES


10)  Date of transaction
     NOT KNOWN


11)  Date company informed
     30 SEPTEMBER 2003


12)  Total holding following this notification
     174,029,018

               
13)  Total percentage holding of issued class following this notification
     13.61%


14)  Any additional information
     -


15)  Name of contact and telephone number for queries
     MRS MARY FORD, TEL: [phone]


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

     Date of Notification
     30 SEPTEMBER 2003


Letter to Aggregate Industries Plc 


25p ORDINARY SHARES ("SHARES")

We write to advise you that we, Schroder Investment Management Limited, have an
interest in 170,279,018 shares which are held in portfolios managed by us on a
discretionary basis for clients under investment management agreements.

Included in this figure are:-

(i)   66,605,548 shares registered or to be registered in the name of our
      wholly-owned subsidiary nominee company, Schroder Nominees Limited
      (Schroder Nominees),

(ii)  36,148,649 shares held in (a) unit trust(s) operated and managed by
      an affiliated company, Schroder Unit Trusts Limited (SUTL), and
      registered or to be registered in the name of Chase Nominees Limited,

(iii) 67,524,821 shares neither registered nor to be registered in the name of
      Schroder Nominees Ltd. The registration details are shown in the
      schedule below.

An affiliated company, Schroder Investment Management North America Inc 
(SIMNA Inc) is managing (a) portfolio(s) on a similar basis holding a further 
3,750,000 shares. These shares are registered or to be registered in the name 
of Chase Nominees Limited.

We believe that we and our affiliated company are therefore interested in an
overall aggregate of 174,029,018 shares, representing some 13.740% of the total
number of shares in issue, namely 1,266,578,876.

This notification is made to you:-

(a)   in respect of our interest as investment managers,

(b)   on behalf of SIMNA Inc and SUTL in relation to the interests they are 
      treated as having respectively under the Companies Act 1985 (the Act), and

(c)   on behalf of Schroders plc., our holding company, which is treated as 
      having an interest in all of the above shares under the Act by virtue of
      its ownership of SIMNA Inc, SUTL and ourselves.


From Schroder Investment Management Limited

                
                       25p ORDINARY SHARES

                             SCHEDULE

REGISTRATION                                                AMOUNT

Bank of New York                                            19,192
British Coal Staff Superannuation a/c: P                 2,804,800
Brown Brothers Harriman                                  2,264,331
Brown Brothers Harriman a/c SCIL                            29,700
BT Globenet Nominees Ltd. a/c: 6B                       16,163,800
Deutsche Bank                                               35,500
Chase Manhattan Bank                                     2,698,765
Chase Nominees Limited                                   9,874,113
HSBC Global Custody Nom.(UK) Ltd a/c: 809955             1,291,159
HSBC Global Custody Nominee (UK) Ltd                     5,577,770
HSBC Global Custody Nominee (UK) Ltd a/c: 771401           202,000
Mellon Trust                                             1,662,600
Mineworkers' Pension Scheme a/c: R                       3,228,764
Morgan Nominees Limited a/c: CCC                         2,731,000
Morgan Nominees Limited a/c: GRL-Crest ID:AG01           1,421,000
Morgan Nominees Ltd                                        702,000
Morgan Nominees Ltd.: A a/c                                 96,400
Morgan Nominees Ltd.: B a/c                              2,714,000
MSS Nominees Limited a/c: 756593                           924,559
Nortrust Nominees Limited                                7,066,933
Nortrust Nominees Limited a/c: SRC13                       229,696
Nutraco Nominees Ltd                                       250,000
Nutraco Nominees Ltd a/c: GWPPMPS                        1,160,000
Pictet & Cie                                             1,144,739
RNSTB Nominees Ltd                                       2,527,000
RBSTB Nominees Ltd. a/c: AAUKPS                            585,000
RBSTB Nominees Ltd. a/c: LAUR                              120,000
                                                        ----------
                                                        67,524,821
                                                        ----------


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