Holding(s) in Company

RNS Number : 9271N

Spirent Communications PLC

26 February 2009

TR-1: notification of major interests in shares

1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached:	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 financial instruments which may result in the acquisition of shares already issued to which voting rights are attached
An event changing the breakdown of voting rights
Other (please specify):___________________________________________
3. Full name of person(s) subject to the notification obligation:	Aviva plc & its subsidiaries
4. Full name of shareholder(s) (if different from 3.):	Registered Holder: BNY Norwich Union Nominees Limited 9,232,246* Chase GA Group Nominees Limited 30,803,753* Chase Nominees Limited 1,534,436* CUIM Nominee Limited 5,166,088* Vidacos Nominees Limited 106,983* * denotes direct interest Chase Nominees Limited 1,808,626 Vidacos Nominees Limited 1,975,332
5. Date of the transaction (and date on which the threshold is crossed or reached if different):	24 February 2009
6. Date on which issuer notified:	25 February 2009
7. Threshold(s) that is/are crossed or reached:	7% to 6% Change at Direct Interest level
8. Notified details:

A: Voting rights attached to shares
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
			Direct	Direct	Indirect	Direct	Indirect
Ordinary Shares GB0004726096	51,634,447	51,634,447	46,843,506	46,843,506	3,783,958	6.97%	0.57%

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

Total (A+B)

Number of voting rights

% of voting rights

50,627,464

7.54%

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

The voting rights are managed and controlled by Aviva Investors Global Services Limited,with the following chain of controlled undertakings:-

Aviva Investors Global Services Limited:

Aviva plc (Parent Company)
Aviva Group Holdings Limited (wholly owned subsidiary of Aviva plc)
Aviva Investors Holdings Limited (wholly owned subsidiary of Aviva Group Holdings Limited)
Aviva Investors Global Services Limited (wholly owned subsidiary of Aviva Investors Holdings Limited)

Proxy Voting:
10. Name of the proxy holder:		See Section 4
11. Number of voting rights proxy holder will cease to hold:
12. Date on which proxy holder will cease to hold voting rights:
13. Additional information:	Figures are based on a total number of voting rights of 671,812,370.
14. Contact name:	Neil Whittaker
15. Contact telephone number:	01603 684420