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, 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- ________ 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 HBOS plc 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 SHAREHOLDER IN 2 ABOVE 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 A/C CMIG1105 879,344 Chase Nominees Ltd A/C CMIG194 7,738 Chase Nominees Ltd A/C CMIG 237 697,223 Pershing Keen Nominees (AD0086) 1,123 HSBC Global Custody Nominees (UK) Ltd (EQINC) 1,062,759 HSBC Global Custody Nominees (UK) Ltd (EQPEL) 2,906,496 HSBC Global Custody Nominees (UK) Ltd (EQSTR) 229,750 State Street Nominees (FE1D) 7,250 State Street Nominees (FE1F) 37,392 Morgan Nominees Limited (HLBA) 457,082 Morgan Nominees Limited (HLFO) 449,618 Morgan Nominees Limited (HPBA) 19,685 Morgan Nominees Limited (HPFO) 17,006 Morgan Nominees Limited (HXLFE) 514,516 Morgan Nominees Limited (HXPEN) 20,274 Chase Nominees Ltd A/C T19795 (IPEHI) 2,423,577 Chase Nominees Ltd A/C T19795 (IPFGW) 30,000 Chase Nominees Ltd A/C T19795 (IPUDS) 622,804 Pershing Keen Nominees (PD2659) 8,950 St James's Place UK plc (SJP TRACKER) 13,340 Chase Nominees Limited (UKTRA0) 29,157 Chase Nominees Limited (WPUKEQ) 17,743,203 5 Number of shares/ amount of stock acquired - 6 Percentage of Issued Class - 7 Number of shares /amount of stock disposed 5,379,900 8 Percentage of Issued Class 0.57% 9 Class of security ORDINARY SHARES OF 3 1/3p EACH 10 Date of transaction Not notified 11 Date company informed 26 February 2003 12 Total holding following this notification 28,178,287 13 Total percentage holding of issued class following this notification 2.99% 14 Any additional information NOTIFICATION IN ACCORDANCE WITH S.198-202 COMPANIES ACT 1985 THAT THE SHAREHOLDER NAMED IN 2 ABOVE NO LONGER HAS A NOTIFIABLE INTEREST IN THE COMPANY 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 Michael Anscombe - Assistant Company Secretary Date of notification 26 February 2003 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___26 February 2003____ By ____/s/ Luke Thomas____ (Signature)*