Holding(s) in Company

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES

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

Spirent Communications plc

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

An acquisition or disposal of voting rights

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): 'To reflect both the % of 'Voting rights attached to shares' and 'Qualifying Financial Instruments' position held by Prudential plc group of companies as at 28 October, 2016.

Due to an erroneous calculation, we missed a disclosure reflecting our % of 'Voting rights attached to shares' position moving below 10% on 27th October, 2016. This issue been rectified however we have since increased our position back over 10% as at 03 November, 2016. Please see the notification made on 7th November 2016.

X

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

Prudential plc group of companies

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

Prudential plc

The Prudential Assurance Company Limited

M&G Group Limited

M&G Limited

M&G Investment Management Limited

5. Date of the transaction and date onwhich the threshold is crossed orreached: v

27 October 2016

6. Date on which issuer notified:

07 November 2016

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

See item 13

8. Notified details:

A: Voting rights attached to shares viii, ix

Class/type ofshares

if possible usingthe ISIN CODE

Situation previousto the triggeringtransaction

Resulting situation after the triggering transaction

NumberofShares

NumberofVotingRights

Numberof shares

Number of votingrights

% of voting rights x

Direct

Direct xi

Indirect xii

Direct

Indirect

ORD GBP0.03333

GB0004726096

64,310,980

64,310,980

61,159,986

0

61,159,986

0

9.99%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate xiii

Exercise/Conversion Period xiv

Number of votingrights that may beacquired if theinstrument isexercised/ converted.

% of votingrights

ORD GBP0.03333

GB0004726096

(Right of Recall)

552,774

0.09%

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

Resulting situation after the triggering transaction

Type of financialinstrument

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

61,712,760

10.08%

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

Prudential plc (parent Company) - 61,712,760 (10.08%)

The Prudential Assurance Company Limited (wholly owned subsidiary of Prudential plc) - 50,592,299 (8.27%)

M&G Group Limited (wholly owned subsidiary of Prudential plc) - 61,712,760 (10.08%)

M&G Limited (wholly owned subsidiary of M&G Group Limited) - 61,712,760 (10.08%)

M&G Investment Management Limited (wholly owned subsidiary of M&G Limited) - 61,712,760 (10.08%)

Proxy Voting:

10. Name of the proxy holder:

N/A

11. Number of voting rights proxy holder will ceaseto hold:

N/A

12. Date on which proxy holder will cease to holdvoting rights:

N/A

13. Additional information:

Prudential plc has moved below a 10% indirect notifiable interest, excluding the right of recall under the Qualifying Financial Instruments.

14. Contact name:

Owen Smith / John Baker / James Todd

M&G Investment Management Limited

15. Contact telephone number:

020 7004 4517 / 020 7548 2561 / 020 7548 2293

C: Additional information

Contact at Issuer: Michelle Balch, Deputy Company Secretary, Spirent Communications plc

Telephone: 01293 767676