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 03 March, 2003
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
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) 8,717,800
State Street Nominees Ltd (FMRCO) 428,300
State Street Bank & Trust Company (FMRCO) 16,310,700
State Street Bank & Trust (FMTC) 3,137,900
Chase Manhattan Bank London (FISL) 13,654,679
HSBC (FPM) 619,700
Chase Nominees Ltd (FPM) 7,032,896
Northern Trust (FPM) 2,040,200
Chase Manhattan Bank London (FIL) 1,111,725
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
HSBC Client Holdings Nominee (UK) Ltd (FIL) 18,977,005
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 6 Percentage of 7 Number of shares 8 Percentage of Issued
/ amount of Issued /amount of stock
stock acquired disposed Class
Class
9,154,105 N/a N/a
0.97%
9 Class of security 10 Date of transaction 11 Date company informed
ORDINARY SHARES OF 3 1/3p EACH Not notified 03 March 2003
12 Total holding following this notification 13 Total percentage holding of issued class following
this notification
94,269,245
10.00%
14 Any additional information 15 Name of contact and telephone number for queries
Luke Thomas - 01293 767658
16 Name and signature of authorised company official
responsible for making this notification
Date of notification 03 March 2003 Luke Thomas - Deputy Company Secretary
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___03 March 2003 ___ By ____/s/ Luke Thomas____
(Signature)*