Holding(s) in Company

Invensys PLC
19 March 2007

                TR-1: NOTIFICATION OF MAJOR INTERESTS IN SHARES

1. Identity of the issuer or the underlying issuer of                         Invensys plc
existing shares to which voting rights are attached:
2. Reason for the notification (please tick the appropriate box or boxes):
An acquisition or disposal of voting rights                                                     (n/a)
An acquisition or disposal of financial instruments which may result in the acquisition of      (n/a)
shares already issued to which voting rights are attached
An event changing the breakdown of voting rights                                                (n/a)
Other (please specify): Compliance with the Transparency Directive                               (X)
3. Full name of person(s) subject to the notification                Capital Group International, Inc.
obligation:
4. Full name of shareholder(s) (if different from 3.):
5. Date of the transaction (and date on which the threshold is                 15 March 2007
crossed or reached if different):
6. Date on which issuer notified:                                              16 March 2007
7. Threshold(s) that is/are crossed or reached:                                     3%
8. Notified details:


A: Voting rights attached to shares
Class/type of    Situation previous to the Resulting situation after the triggering transaction
shares           Triggering transaction
                 Number of    Number of    Number of shares    Number of voting rights  % of voting rights
 if possible     Shares       Voting
using the ISIN                Rights       Direct  Indirect    Direct    Indirect       Direct     Indirect
CODE
Ord GBP 0.10     28,577,001   28,577,001           28,577,001            28,577,001                3.589%
each


B: Financial Instruments
Resulting situation after the triggering transaction
Type of financial    Expiration date Exercise/ Conversion      Number of voting rights    % of voting rights
instrument                           Period/ Date              that may be acquired if
                                                               the instrument is
                                                               exercised/ converted.
        N/A


Total (A+B)
Number of voting rights                           % of voting rights
                   28,577,001                                               3.589%


9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively
held, if applicable:






Proxy Voting:
10. Name of the proxy holder:                                                        N/A
11. Number of voting rights proxy holder will cease to hold:                         N/A
12. Date on which proxy holder will cease to hold voting rights:                     N/A


13. Additional information:
14. Contact name:                                      Steve Devany, Vice President - Communications
15. Contact telephone number:                                          020 7821 3758






As of 15 March 2007



Invensys plc




                                                      Number of         Percent of
                                                      Shares            Outstanding



Capital Group International, Inc. ("CGII") holdings   28,577,001        3.589%

Holdings by CGII Management Companies and Funds:

________________________________________________________________________________



?     Capital Guardian Trust Company                   1,577,371        0.198%



?     Capital International Limited                   23,347,511        2.9325



?      Capital International S.A.                        931,915        0.117%



?      Capital International, Inc.                     2,720,204        0.342%







                                   Schedule A


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