Holding(s) in Company

Rio Tinto PLC
17 August 2005


                           SCHEDULE 10
 
             NOTIFICATION OF MAJOR INTERESTS IN SHARES


1)   NAME OF COMPANY

     RIO TINTO PLC

2)   NAME OF SHAREHOLDER HAVING A MAJOR INTEREST

     WELLINGTON MANAGEMENT COMPANY, LLP

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

      AS IN (2) ABOVE

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

     WELLINGTON MANAGEMENT COMPANY, LLP

5)   Number of shares/amount of stock acquired.

     UNKNOWN

6)   Percentage of issued Class

      UNKNOWN

7)   Number of shares/amount of stock disposed
       -

8)   Percentage of issued Class
      -

9)   Class of security

      ORDINARY SHARES OF 10P

10)  Date of transaction

      UNKNOWN

11)  Date company informed

      16 AUGUST 2005

12)  Total holding following this notification

      32,324,139
               
13)  Total percentage holding of issued class following this notification

      3.02%

14)  Any additional information



15)  Name of contact and telephone number for queries

      JULIE MEAD  020 7753 2116

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

     Date of Notification ...17 AUGUST 2005.........


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Letter to Rio Tinto Plc
Dated 15 August 2005

Re: Notification concerning interests in shares of Rio Tinto plc (the 'Company') 

Dear Anette Lawless;


1
Wellington Management Company, LLP ('Wellington Management') is registered as an
investment adviser with the United States Securities and Exchange Commission
under Section 203 of the Investment Advisors Act of 1940, as amended and acts as
discretionary investment manager on behalf of various separate accounts (the
'Accounts') that hold an interest in shares of the Company, Wellington
Management's interest in the shares is as an investment manager, as is mentioned
in Section 205(5) of the Companies Act 1985 (the 'Act'). The Accounts do not act
as a group nor do they act in concert with respect to the interests in shares.
Wellington Management acquired the interests in shares for the Accounts in its
capacity as discretionary investment manager to, and solely for the benefit of,
the Accounts, and the interests were acquired solely for investment purposes.
The shares are registered in the name of the Accounts or the Accounts' 
custodians or nominees according to their respective holdings.

2
Wellington Management as discretionary investment manager on behalf of the
Accounts currently holds, in the aggregate, an interest within the meaning of
Sections 203 and 208 of the Act in 32,324,139 ordinary shares, or 3.02% of the
shares outstanding of the Company. This represents an increase of 0.08% since
our last notification on 29 November 2004. Therefore, Wellington Management 
hereby gives notice to the Company of such interest in shares, pursuant to the 
provisions of Sections 198(1) and 208(4)(B) of the Act.

3
This notice is given in fulfillment of, and for the express purpose of
discharging the obligations imposed on us by, Sections 198(1) and 208(4)(B) of
the Act and arising out of the circumstances referred to in paragraph 2.


Letter from Wellington Management Company






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