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:

Spirent Communication plc

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

An acquisition or disposal of voting rights

Yes

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 thenotification obligation:

Legal & General Group Plc (Group)

Legal & General Investment Management Limited (LGIM)

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

Legal & General Group Plc (L&G)

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

16 March 2012

6. Date on which issuer notified:

19 March 2012

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

Group (Above 5%)

LGIM (Above 5%)

8. Notified details:

A: Voting rights attached to shares

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

Direct

Indirect

Direct

Indirect

Ordinary GBP 0.03332

 Below 5%

As of 12/03/2012

 33,553,871

 27,742,771

5,811,100

4.19%

0.88%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate

Exercise/Conversion Period

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

% of votingrights

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Exercise price

Expiration date

Exercise/Conversion period

Number of voting rights instrument refers to

% of voting rights

CFD

N/A

N/A

N/A

 225,000

Nominal

Delta

0.03%

0.03%

Total (A+B+C)

Number of voting rights

Percentage of voting rights

 33,778,871

5.10%

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

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:

Notification using the total voting rights figure of  662,047,878

14. Contact name:

Paul Toon (LGIM)

15. Contact telephone number:

020 3124 3854

C: Additional information

Contact at Issuer: Rachel Whiting, Company Secretary, Spirent Communications plc

Telephone: 01293 767676