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 December, 2002
SPIRENT 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- ________
London Stock Exchange
NOTIFICATION OF MAJOR INTERESTS IN SHARES
All relevant boxes should be completed in block capital letters
1 Name of company
SPIRENT plc
2 Name of shareholder having a major interest
FMR Corp. and Fidelity International Limited
3 Please state whether notification indicates that it is in
Respect of holding of the shareholder named in 2 above or
In respect of a non-beneficial interest or in the case of
an individual holder if it is a holding of that person's
spouse or children under the age of 18
Companies named in box 2 above and their direct and
indirect subsidiaries, being non-beneficial holders.
4 Name of the registered holder(s) and, if more
than one holder, the number of shares held by
each of them
Chase Nominees Ltd (FMRCO) 7,011,700
State Street Nominees Ltd (FMRCO) 1,326,900
State Street Bank & Trust (FMTC) 2,184,900
Chase Manhattan Bank London (FISL) 12,462,979
HSBC (FPM) 619,700
Chase Nominees Ltd (FPM) 7,032,896
Northern Trust (FPM) 2,040,200
Chase Manhattan Bank London (FIL) 1,342,648
Bank of New York Brussels (FIL) 805,100
Northern Trust (FIL) 3,044,100
Chase Nominees Ltd (FIL) 9,979,540
Bank of New York London (FIL) 5,006,000
Nortrust Nominees Ltd (FIL) 3,107,200
State Street Bank & Trust (FIL) 296,400
TOTAL 56,260,263
FMRCO - Fidelity Management & Research Company
FMTC - Fidelity Management Trust Company
FISL - Fidelity Investment Services Ltd
FPM - Fidelity Pension Management
FIL - Fidelity International Ltd
5 Number of shares/amount
of stock acquired
10,647,000
6 Percentage of Issued
Class
1.13 %
7 Number of shares/amount
of stock disposed
N/a
8 Percentage of Issued
Class
N/a
9 Class of security
ORDINARY SHARES OF 3 1/3p EACH
10 Date of transaction
Not notified
11 Date company informed
30 December 2002
12 Total holding following this notification
56,260,263
13 Total percentage holding of issued class following
this notification
5.99%
14 Any additional information
15 Name of contact and telephone number for queries
Michael Anscombe - 01293 767672
16 Name and signature of authorised company official
responsible for making this notification
Paul Eardley, Company Secretary, Spirent plc
Date of notification 30 December 2002
London Stock Exchange, Company Announcements Office, Old Broad Street, London
EC2N 1HP
Facsimile: 0207 588 6057, 0207 334 8964/8965/8966 (PLEASE DO NOT POST)
Enquries: Continuing Obligations: Telephone: 0207 797 3850/1639/1972/3150
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.
______LUKE THOMAS______
(Registrant)
Date___30 December 2002____ By ____/s/ Luke Thomas____
(Signature)*