Holding(s) in Company

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi

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

Invensys plc

2 Reason for the notification (please tick the appropriate box or boxes):

An acquisition or disposal of voting rights

X

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

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments

An event changing the breakdown of voting rights

Other (please specify):

3. Full name of person(s) subject to the notification obligation: iii

Prudential plc group of companies

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

See attached schedule

5. Date of the transaction and date on which the threshold is crossed or reached: v

06 April 2010

6. Date on which issuer notified:

07 April 2010

7. Threshold(s) that is/are crossed or reached: vi, vii

See item 13

8. Notified details:

A: Voting rights attached to shares viii, ix

Class/type of shares

if possible using the ISIN CODE

Situation previous to the triggering transaction

Resulting situation after the triggering transaction

Number of Shares

Number of Voting Rights

Number of shares

Number of voting rights

% of voting rights x

Direct

Direct xi

Indirect xii

Direct

Indirect

GB00B19DVX61

81,554,813

81,554,813

81,192,241

80,529,103

663,138

9.978%

0.082%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration date xiii

Exercise/ Conversion Period xiv

Number of voting rights that may be acquired if the instrument is exercised/ converted.

% of voting rights

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments xv, xvi

Resulting situation after the triggering transaction

Type of financial instrument

Exercise price

Expiration date xvii

Exercise/ Conversion period xviii

Number of voting rights instrument refers to

% of voting rights xix, xx

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

81,192,241

10.06%

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

Prudential plc (parent Company)

M&G Group Limited (wholly owned subsidiary of Prudential plc)

M&G Limited (wholly owned subsidiary of M&G Group Limited)

M&G Investment Management Limited (wholly owned subsidiary of M&G Limited)

The Prudential Assurance Company Limited (wholly owned subsidiary of Prudential Plc)

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:

M&G Group Limited (wholly owned subsidiary of Prudential plc), M&G Limited (wholly owned subsidiary of M&G Group Limited) and M&G Investment Management Limited (wholly owned subsidiary of M&G Limited) has dropped below a 10% notifiable interest triggering this notification.

Calculations based on a Total Voting Rights figure of 807,059,602.

14. Contact name:

Steve Devany, Head of Corporate Communications

15. Contact telephone number:

020 7821 3758

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HOLDING

% Total Notification of Interests

PRUDENTIAL PLC

81,192,241

10.06

REGISTERED HOLDER

NORTRUST NOMINEE LTD A/C MNJ01

429,127

PRUCLT HSBC GIS NOM(UK) PPL AC

5,434,841

NORTRUST NOMS LTD A/C PUR01

7,944,254

NORTRUST NOMS LTD

229,472

NORTRUST NOMS LTD A/C PUF01

541,811

JP MORGAN NOMINEES

523,138

NORTRUST NOMS LIMITED A/C PUS01

38,552

STATE STREET NOMS

140,000

PRUCLT HSBC GIS NOM(UK) PAC AC

30,480,188

NORTRUST NOMS LIMITED A/C PUI01

64,307

NORTRUST NOMINEE LTD A/C MKB01

876,156

NORTRUST NOMINEE LTD A/C MKK01

32,000,000

NORTRUST NOMINEE LTD A/C MNB01

2,308,451

NORTRUST NOMINEE LTD A/C MHF01

181,944

HOLDING

% Total Notification of Interests

M&G GROUP LIMITED

80,669,103

9.99

REGISTERED HOLDER

NORTRUST NOMINEE LTD A/C MNJ01

429,127

PRUCLT HSBC GIS NOM(UK) PPL AC

5,434,841

NORTRUST NOMS LTD A/C PUR01

7,944,254

NORTRUST NOMS LTD

229,472

NORTRUST NOMS LTD A/C PUF01

541,811

NORTRUST NOMS LIMITED A/C PUS01

38,552

STATE STREET NOMS

140,000

PRUCLT HSBC GIS NOM(UK) PAC AC

30,480,188

NORTRUST NOMS LIMITED A/C PUI01

64,307

NORTRUST NOMINEE LTD A/C MKB01

876,156

NORTRUST NOMINEE LTD A/C MKK01

32,000,000

NORTRUST NOMINEE LTD A/C MNB01

2,308,451

NORTRUST NOMINEE LTD A/C MHF01

181,944

M&G INVESTMENT MANAGEMENT LIMITED

HOLDING

% Total Notification of Interests

80,487,159

9.97

REGISTERED HOLDER

NORTRUST NOMINEE LTD A/C MNJ01

429,127

PRUCLT HSBC GIS NOM(UK) PPL AC

5,434,841

NORTRUST NOMS LTD A/C PUR01

7,944,254

NORTRUST NOMS LTD

229,472

NORTRUST NOMS LTD A/C PUF01

541,811

NORTRUST NOMS LIMITED A/C PUS01

38,552

STATE STREET NOMS

140,000

PRUCLT HSBC GIS NOM(UK) PAC AC

30,480,188

NORTRUST NOMS LIMITED A/C PUI01

64,307

NORTRUST NOMINEE LTD A/C MKB01

876,156

NORTRUST NOMINEE LTD A/C MKK01

32,000,000

NORTRUST NOMINEE LTD A/C MNB01

2,308,451

M&G LIMITED

HOLDING

% Total Notification of Interests

80,669,103

9.99

REGISTERED HOLDER

NORTRUST NOMINEE LTD A/C MNJ01

429,127

PRUCLT HSBC GIS NOM(UK) PPL AC

5,434,841

NORTRUST NOMS LTD A/C PUR01

7,944,254

NORTRUST NOMS LTD

229,472

NORTRUST NOMS LTD A/C PUF01

541,811

NORTRUST NOMS LIMITED A/C PUS01

38,552

STATE STREET NOMS

140,000

PRUCLT HSBC GIS NOM(UK) PAC AC

30,480,188

NORTRUST NOMS LIMITED A/C PUI01

64,307

NORTRUST NOMINEE LTD A/C MKB01

876,156

NORTRUST NOMINEE LTD A/C MKK01

32,000,000

NORTRUST NOMINEE LTD A/C MNB01

2,308,451

NORTRUST NOMINEE LTD A/C MHF01

181,944

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HOLDING

% Total Notification of Interests

The Prudential Assurance Company Limited

35,915,029

4.45

REGISTERED HOLDER

PRUCLT HSBC GIS NOM(UK) PPL AC

5,434,841

PRUCLT HSBC GIS NOM(UK) PAC AC

30,480,188