TR-1:    Notifications of Major Interests in Shares

Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached:

Invensys plc

Reason for notification (yes/no)

An acquisition or disposal of voting rights

yes

An acquisition or disposal of financial instruments which may result in the acquisition of shares already issued to which voting rights are attached

x

An event changing the breakdown of voting rights

x

Other (please specify):

x

Full name of person(s) subject to notification obligation:

Standard Life Investments Ltd

Full name of shareholder(s) (if different from 3):

Vidacos Nominees

Date of transaction (and date on which the threshold is crossed or reached if different):

19 September 2008

Date on which issuer notified:

22 September 2008

Threshold(s) that is/are crossed or reached:

15%

Notified Details

Voting rights attached to shares

Class/type of share    If possible use ISIN code

GB00B19DVX61

Situation previous to the triggering transaction

Number of shares

Number of voting rights

126,919,578

126,919,578

Resulting situation after the triggering transaction

Number of shares

Number of voting rights

Percentage of
voting rights

Direct

Indirect

Direct

Indirect

118,603,257

62,761,959

55,841,298

7.846%

6.981%

Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration date

Exercise/ conversion period/date

No. of voting rights that may be acquired
(if the instrument exercised/converted)

Percentage of voting rights

Total (A+B)

Number of voting rights

Percentage of voting rights

118,603,257

14.814 %

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

Standard Life Investments Ltd

Proxy Voting:

Name of proxy holder:

Number of voting rights proxy holder will cease to hold:

Date on which proxy holder will cease to hold voting rights:

Additional information:

Contact name:

Steve Devany

Contact telephone number:

020 7821 3758