RNS Number:0560T
Aggregate Industries PLC
9 December 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

      SEE BELOW

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

      SEE BELOW

5)   Number of shares/amount of stock acquired.

      NOT ADVISED

6)   Percentage of issued Class

      NOT ADVISED
7)   Number of shares/amount of stock disposed

      NOT ADVISED

8)   Percentage of issued Class

      NOT ADVISED
9)   Class of security

      ORDINARY 25P SHARES

10)  Date of transaction

      NOT KNOWN

11)  Date company informed

      9 DECEMBER 2003

12)  Total holding following this notification

      156,361,477
               
13)  Total percentage holding of issued class following this notification

      12.20%

14)  Any additional information



15)  Name of contact and telephone number for queries

      MRS MARY FORD
      01530 816615

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

     Date of Notification ...9 DECEMBER 2003.....



LETTER TO:  AGGREGATE INDUSTRIES PLC   

25p ORDINARY SHARES ("SHARE")

We write to advise you that we, Schroder Investment Management Limited, have an
interest in 156,361,477 shares which are held in portfolios managed by us on a
discretionary basis for clients under investment management agreements.

We believe that our interest represents some 12.20% of the total number of 
shares in issue, namely 1,281,686,077

Included in this figure are:-

(i)  62,497,833 shares registered or to be registered in the name of our
     wholly-owned subsidiary nominee company, Schroder Nominees Limited
     (Schroder Nominees),

(ii) 35,356,422 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) 58,507,222 shares neither registered nor to be registered in the name of
      Schroder Nominees Ltd.  The registration details are shown on the schedule 
      below.

This notification is made to you:

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

(b) on behalf of SUTL in relation to the interest 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 SUTL and ourselves.


FROM:    ALISON DUNN
         REGULATORY REPORTING OFFICER
         

                                
                                   SCHEDULE
                
                           25p ORDINARY SHARES

REGISTRATION                                           AMOUNT

Bank of New York                                          19,192
British Coal Staff Superannuation a/c: P               2,600,000
Brown Brothers Harriman                                2,322,795
Brown Brothers Harriman a/c SCIL                          21,000
BT Globenet Nominees Ltd. a/c: 6B                     15,009,800
Deutsche Bank                                             35,500
Chase Manhattan Bank                                   2,378,746
Chase Nominees Limited                                 5,852,813
HSBC Global Custody Nom.(UK) Ltd a/c: 809955           1,291,159
HSBC Global Custody Nominee (UK) Ltd                   2,715,040
Mellon Trust                                           1,662,600
Mineworkers' Pension Scheme a/c: R                     2,900,000
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                              7,745,733
Nortrust Nominees Limited a/c: SRC13                     229,696
Nutraco Nominees Ltd                                     203,900
Nutraco Nominees Ltd a/c: GWPPMPS                      1,160,000
Pictet & Cie                                           1,123,289
RNSTB Nominees Ltd                                     2,527,000
RBSTB Nominees Ltd. a/c: LAUR                            120,000
 
                                                      58,507,222




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