Holding(s) in Company

Spirent Communications PLC
27 December 2007


TR-1:     NOTIFICATION OF MAJOR INTERESTS IN SHARES 


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

2. Reason for notification (yes/no)

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                                        Yes

Other (please specify):______________

3. Full name of person(s) subject to the notification              Legal & General Group Plc (Group)
obligation:
                                                                 Legal & General Investment Management
                                                                            Limited (LGIM)

4. Full name of shareholder(s) (if different from 3.):            Legal & General Assurance (Pensions
                                                                       Management) Limited (PMC)

                                                                    Legal & General Group Plc (L&G)
5. Date of the transaction (and date on which the threshold is             21 December 2007
crossed or reached if different):

6. Date on which issuer notified:                                          24 December 2007

7. Threshold(s) that is/are crossed or reached:                            Above 5% (Group)

                                                                            Above 5% (LGIM)


8. Notified details:


A: Voting rights attached to shares
Class/type of   Situation previous to  Resulting situation after the triggering transaction
shares          the Triggering
                transaction
 if possible    Number of  Number of   Number of    Number of voting rights   % of voting rights
using the ISIN  Shares     Voting      shares
CODE                       Rights      Direct       Direct       Indirect     Direct       Indirect
ORD                   Below 5%         36,924,304   36,924,304   2,764,646    4.656        0.348

GBX3.333333


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



Total (A+B)
Number of voting rights                            % of voting rights

    39,688,950                                              5.00



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

Legal & General Group Plc (Direct and Indirect) (Group) (39,688,950 - 5.00%
= Total Position)

Legal & General Investment Management (Holdings) Limited (LGIMH) (Direct
and Indirect)  (39,688,950 - 5.00% = Total Position)

Legal & General Investment Management Limited (Indirect) (LGIM) (39,688,950
- 5.00% = Total Position)

                   Legal & General Group Plc (Direct) (L&G) (36,924,304 - 4.65 % = LGAS, LGPL & PMC)

Legal & General Investment Management (Holdings) Limited       Legal & General Insurance Holdings Limited (Direct)
(Direct) (LGIMHD) (33,053,891 -4.16 % = PMC)                   (LGIH)

Legal & General Assurance (Pensions Management) Limited  (PMC) Legal & General Assurance Society Limited  (LGAS & LGPL)
(33,053,891 -4.16 % = PMC)

                                                               Legal & General Pensions Limited (Direct)  (LGPL)


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:               Notification using the total voting rights figure of
                                                                       792,989,543

14. Contact name:                                                   Helen Lewis (LGIM)

15. Contact telephone number:                                         020 3124 3851


Additional information

Contact at Issuer: Michael Anscombe, Company Secretary, Spirent Communications plc
Telephone: [phone]




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