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 (Fidelity Investment 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
Company named in box 2 above and its 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 Limited (FMRCO) 7,011,700
State Street Nominees Limited (FMRCO) 679,900
State Street Bank & Trust (FMTC) 2,184,900
Chase Manhattan Bank London (FISL) 12,462,979
HSBC (FPM) 452,800
Chase Nominees Limited (FPM) 4,032,796
Northern Trust (FPM) 1,459,100
Chase Manhattan Bank London (FIL) 1,000,348
Bank of New York Brussels (FIL) 582,900
Northern Trust (FIL) 2,057,500
Chase Nominees Limited (FIL) 7,236,840
Bank of New York London (FIL) 3,067,800
Nortrust Nominees Limited (FIL) 2,259,800
State Street Bank & Trust (FIL) 123,900
5 Number of shares 6 Percentage of 7 Number of shares 8 Percentage of
/ amount of Issued /amount of stock Issued
stock acquired Class disposed Class
10,662,047 1.13% N/a N/a
9 Class of security 10 Date of transaction
ORDINARY SHARES OF 3 1/3p EACH Not notified
11 Date company informed
17 December 2002
12 Total holding following this notification
45,613,263
13 Total percentage holding of issued class following
this notification
4.86%
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
LUKE THOMAS, DEPUTY SECRETARY, SPIRENT PLC
Date of notification 17 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 17 December 2002 By ____/s/ Luke Thomas____
(Signature)*