UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 6-K
REPORT OF FOREIGN PRIVATE ISSUER
PURSUANT TO RULE 13a-16 OR 15d-16
UNDER THE SECURITIES EXCHANGE ACT OF 1934
For the month of February, 2007
SPIRENT COMMUNICATIONS plc
_____________________________________________________________________
(Translation of registrant's name into English)
Spirent House, Crawley Business Quarter, Fleming Way, Crawley, West Sussex
RH10 9QL, UK.
_____________________________________________________________________
(Address of principal executive offices)
Indicate by check mark whether the registrant files or will file annual reports
under cover Form 20-F or Form 40-F.
Form 20-F X Form 40-F.....
Indicate by check mark whether the registrant by furnishing the information
contained in this Form is also thereby furnishing the information to the
Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.
Yes ..... No X
If "Yes" is marked, indicate below the file number assigned to the registrant
in connection with Rule 12g3-2(b): 82- ________
TR-1(i): 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(ii):
2. Reason for the notification (please tick the appropriate box or boxes): n/a see additional information
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): Initial implementation of the Transparency Directive X
3. Full name of person(s) subject to the notification Legal & General Group Plc (L&G)
obligation(iii):
4. Full name of shareholder(s) (if different from 3.)(iv): Legal & General Assurance (Pensions
Management) Limited (PMC)
5. Date of the transaction and date on which the threshold is N/A
crossed or reached(v):
6. Date on which issuer notified: 19/02/07
7. Threshold(s) that is/are crossed or reached: Above 3% (L&G)
8. Notified details:
A: Voting rights attached to shares
Class/type of Situation previous to Resulting situation after the triggering transaction(vii)
shares the Triggering
transaction (vi)
if possible Number of Number of Number of Number of voting rights % of voting rights
using the ISIN Shares Voting shares ix
CODE Rights
viii Direct Direct x Indirect xi Direct Indirect
GBX Ord 3.333333 30,146,753 3.16% 32,253,928 32,253,928 3.64%
(Under S-198 on 02/08/04)
B: Financial Instruments
Resulting situation after the triggering transaction xii
Type of financial Expiration date Exercise/ Conversion Number of voting rights % of voting
instrument xiii Period/ Date xiv that may be acquired if rights
the instrument is
exercised/ converted.
Total (A+B)
Number of voting rights % of voting rights
32,253,928 3.64%
9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively
held, if applicable xv:
Legal & General Group Plc (Direct and Indirect) (Group)
Legal & General Investment Management (Holdings) Limited (LGIMH) (Direct and Indirect)
Legal & General Investment Management Limited (Indirect) (LGIM)
Legal & General Group Plc (Direct) (L&G) (32,253,928 - 3.64% = LGAS, LGPL & PMC)
Legal & General Investment Management (Holdings) Limited Legal & General Insurance Holdings Limited (Direct)
(Direct) (LGIMHD) (27,833,444 - 3.14% = PMC) (LGIH)
Legal & General Assurance (Pensions Management) Limited (PMC) Legal & General Assurance Society Limited (LGAS & LGPL)
(27,833,444 - 3.14% = 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
885,719,966
First notification under DTR Sourcebook
14. Contact name: Helen Lewis
15. Contact telephone number: 020 7528 6742
Additional Information
Contact at Issuer: Michael Anscombe (Deputy Company Secretary)
Spirent Communications plc
Telephone: 01293 767676
Notes to the Forms
--------------------------
(i) This form is to be sent to the issuer or underlying issuer and
to be filed with the competent authority.
(ii) Either the full name of the legal entity or another method
for identifying the issuer or underlying issuer, provided it is reliable and
accurate.
(iii) This should be the full name of (a) the shareholder; (b) the
natural person or legal entity acquiring, disposing of or exercising voting
rights in the cases provided for in DTR5.2.1 (b) to (h); (c) all the parties to
the agreement referred to in DTR5.2.1 (a), or (d) the holder of financial
instruments entitled to acquire shares already issued to which voting rights are
attached, as appropriate.
In relation to the transactions referred to in points DTR5.2.1 (b) to (h) , the
following list is provided as indication of the persons who should be mentioned:
- in the circumstances foreseen in DTR5.2.1 (b), the natural
person or legal entity that acquires the voting rights and is entitled to
exercise them under the agreement and the natural person or legal entity who is
transferring temporarily for consideration the voting rights;
- in the circumstances foreseen in DTR 5.2.1 (c), the natural
person or legal entity holding the collateral, provided the person or entity
controls the voting rights and declares its intention of exercising them, and
natural person or legal entity lodging the collateral under these conditions;
- in the circumstances foreseen in DTR5.2.1(d), the natural person
or legal entity who has a life interest in shares if that person or entity is
entitled to exercise the voting rights attached to the shares and the natural
person or legal entity who is disposing of the voting rights when the life
interest is created;
- in the circumstances foreseen in DTR5.2.1 (e), the controlling
natural person or legal entity and, provided it has a notification duty at an
individual level under DTR 5.1, under DTR5.2.1 (a) to (d) or under a combination
of any of those situations, the controlled undertaking;
- in the circumstances foreseen in DTR5.2.1 (f), the deposit taker
of the shares, if he can exercise the voting rights attached to the shares
deposited with him at his discretion, and the depositor of the shares allowing
the deposit taker to exercise the voting rights at his discretion;
- in the circumstances foreseen in DTR5.2.1 (g), the natural
person or legal entity that controls the voting rights;
- in the circumstances foreseen in DTR5.2.1 (h), the proxy holder,
if he can exercise the voting rights at his discretion, and the shareholder who
has given his proxy to the proxy holder allowing the latter to exercise the
voting rights at his discretion.
(iv) Applicable in the cases provided for in DTR 5.2.1 (b) to (h).
This should be the full name of the shareholder who is the counterparty to the
natural person or legal entity referred to in DTR5.2 unless the holdings of the
shareholder would be lower than 5% of the total number of voting rights.
(v) The date of the transaction should normally be, in the case of
an on exchange transaction, the date on which the matching of orders occurs; in
the case of an off exchange transaction, date of the entering into an agreement.
The date on which threshold is crossed should normally be the date on which the
acquisition, disposal or possibility to exercise voting rights takes effect. For
passive crossings, the date when the corporate event took effect.
(vi) Please refer to the situation disclosed in the previous
notification, In case the situation previous to the triggering transaction was
below 5%, please state 'below 5%'.
vii If the holding has fallen below the minimum threshold , the notifying party
should not be obliged to disclose the extent of the holding, only that the new
holding is less than 5%.
For the case provided for in DTR5.2.1(a), there should be no disclosure of
individual holdings per party to the agreement unless a party individually
crosses or reaches an Article 9 threshold. This applies upon entering into,
introducing changes to or terminating an agreement.
viii Direct and indirect
ix In case of combined holdings of shares with voting rights
attached 'direct holding' and voting rights 'indirect holdings', please split
the voting rights number and percentage into the direct and indirect columns-if
there is no combined holdings, please leave the relevant box blank.
X Voting rights to shares held by notifying party (DTR 5.1)
xi Voting rights held by the notifying party independently
of any holding of shares (DTR 5.2.1)
xii If the holding has fallen below the minimum threshold, the
notifying party should not be obliged to disclose the extent of the holding,
only that the new holding is below 5%.
xiii date of maturity / expiration of the finical instrument i.e.
the date when the right to acquire shares ends.
xiv If the financial instrument has such a period-please
specify the period- for example once every three months starting form the (date)
xv The notification should include the name(s) of the controlled
undertakings through which the voting rights are held. The notification should
also include the amount of voting rights and the percentage held by each
controlled undertaking, [DEL:i:DEL]nsofar as individually the controlled
undertaking holds 5% or more, and insofar as the notification by the parent
undertaking is intended to cover the notification obligations of the controlled
undertaking.
xvi This annex is only to be filed with the competent authority.
xvii Whenever another person makes the notification on behalf of the
shareholder or the natural person/legal entity referred to in DTR5.2 and
DTR5.3.
Signatures
Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized.
______MICHAEL ANSCOMBE______
(Registrant)
Date: 20 February, 2007 By ____/s/ Michael Anscombe____
(Signature)*