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 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 INTERESTS OF DIRECTORS AND CONNECTED PERSONS All relevant boxes should be completed in typed block capital letters. 1 Name of company SPIRENT plc 2 Name of director NICHOLAS KELVIN BROOKES 3 Please state whether notification indicates that it is in Respect of holding of the director named in 2 above or Holding of that person's spouse or children under the age of 18 or in respect of a non-beneficial interest In respect of the Director's Holding 4 Name of the registered holder(s) and, if more than one holder, the number of shares held by each of them. (If notified) Not applicable 5 Please state whether notification relates to a person(s) connected with the director named in 2 above and identify The connected person(s) Not applicable 6 Please state the nature of the transaction. For PEP transactions please indicate whether general/single co PEP and if discretionary/non discretionary. Not applicable 7 Number of shares/amount of stock acquired - 8 Percentage of issued Class - 9 Number of shares/amount of stock disposed - 10 Percentage of Issued Class - 11 Class of security - 12 Price per share - 13 Date of transaction - 14 Date company informed - 15 Total holding following this notification 16 Total percentage holding of issued class following this notification If a director has been granted options by the company please complete the following boxes. 17 Date of grant 25 March 2003 18 Period during which or date on which exercisable 25 March 2006 - 24 March 2013 19 Total amount paid (if any) for grant of the option Not applicable 20 Description of shares or debentures involved: class, Number 1,692,000 Options over Ordinary shares of 3 1/3 p each 21 Exercise price (if fixed at time of grant) or indication that Price is to be fixed at time of exercise 16.00 pence each 22 Total number of shares or debentures over which options Held following this notification 3,602,135 Options over Ordinary shares of 3 1/3 p each 23 Any additional information Option awarded under the Company's Executive Share Option Scheme 24 Name of contact and telephone number for queries Michael Anscombe - 01293 767676 25 Name and signature of authorised company official Responsible for making this notification Date of notification - 26 March 2003 Michael Anscombe Assistant Company Secretary London Stock Exchange, Company Announcements Office, Old Broad Street, London EC2N 1HP Facsimile: 020 7588 6057, 020 7334 8964/8965/8966 (PLEASE DO NOT POST) Enquiries: Continuing obligations: Telephone: 020 7797 3850/1639/1972/3150 London Stock Exchange NOTIFICATION OF INTERESTS OF DIRECTORS AND CONNECTED PERSONS All relevant boxes should be completed in typed block capital letters. 1 Name of company SPIRENT plc 2 Name of director ERIC GEORGE HUTCHINSON 3 Please state whether notification indicates that it is in Respect of holding of the director named in 2 above or Holding of that person's spouse or children under the age of 18 or in respect of a non-beneficial interest In respect of the Director's Holding 4 Name of the registered holder(s) and, if more than one holder, the number of shares held by each of them. (If notified) Not applicable 5 Please state whether notification relates to a person(s) connected with the director named in 2 above and identify The connected person(s) Not applicable 6 Please state the nature of the transaction. For PEP transactions please indicate whether general/single co PEP and if discretionary/non discretionary. Not applicable 7 Number of shares/amount of stock acquired - 8 Percentage of issued Class - 9 Number of shares/amount of stock disposed - 10 Percentage of Issued Class - 11 Class of security - 12 Price per share - 13 Date of transaction - 14 Date company informed - 15 Total holding following this notification 16 Total percentage holding of issued class following this notification If a director has been granted options by the company please complete the following boxes. 17 Date of grant 25 March 2003 18 Period during which or date on which exercisable 25 March 2006 - 24 March 2013 19 Total amount paid (if any) for grant of the option Not applicable 20 Description of shares or debentures involved: class, Number 1,128,000 Options over Ordinary shares of 3 1/3 p each 21 Exercise price (if fixed at time of grant) or indication that Price is to be fixed at time of exercise 16.00 pence each 22 Total number of shares or debentures over which options Held following this notification 2,131,190 Options over Ordinary shares of 3 1/3 p each 23 Any additional information Option awarded under the Company's Executive Share Option Scheme 24 Name of contact and telephone number for queries Michael Anscombe - 01293 767676 25 Name and signature of authorised company official Responsible for making this notification Date of notification - 26 March 2003 Michael Anscombe Assistant Company Secretary London Stock Exchange, Company Announcements Office, Old Broad Street, London EC2N 1HP Facsimile: 020 7588 6057, 020 7334 8964/8965/8966 (PLEASE DO NOT POST) Enquiries: Continuing obligations: Telephone: 020 7797 3850/1639/1972/3150 London Stock Exchange NOTIFICATION OF INTERESTS OF DIRECTORS AND CONNECTED PERSONS All relevant boxes should be completed in typed block capital letters. 1 Name of company SPIRENT plc 2 Name of director MY ENGU CHUNG 3 Please state whether notification indicates that it is in Respect of holding of the director named in 2 above or Holding of that person's spouse or children under the age of 18 or in respect of a non-beneficial interest In respect of the Director's Holding 4 Name of the registered holder(s) and, if more than one holder, the number of shares held by each of them. (If notified) Not applicable 5 Please state whether notification relates to a person(s) connected with the director named in 2 above and identify The connected person(s) Not applicable 6 Please state the nature of the transaction. For PEP transactions please indicate whether general/single co PEP and if discretionary/non discretionary. Not applicable 7 Number of shares/amount of stock acquired - 8 Percentage of issued Class - 9 Number of shares/amount of stock disposed - 10 Percentage of Issued Class - 11 Class of security - 12 Price per share - 13 Date of transaction - 14 Date company informed - 15 Total holding following this notification 16 Total percentage holding of issued class following this notification If a director has been granted options by the company please complete the following boxes. 17 Date of grant 25 March 2003 18 Period during which or date on which exercisable ESOS: 25 March 2006 - 24 March 2013. SSOP: 25% vest on 25 March 2004 and 25% annually thereafter. The final SSOP exercise date will be 24 March 2010. 19 Total amount paid (if any) for grant of the option Not applicable 20 Description of shares or debentures involved: class, Number 225,000 ESOS Options over Ordinary shares of 3 1/3 p each 1,000,000 SSOP Options over Ordinary shares of 3 1/3 p each 21 Exercise price (if fixed at time of grant) or indication that Price is to be fixed at time of exercise 16.00 pence each 22 Total number of shares or debentures over which options Held following this notification 3,131,609 Options over Ordinary shares of 3 1/3 p each 23 Any additional information Options awarded under the: Company's Executive Share Option Scheme (ESOS); and Spirent Stock Option Plan (SSOP) 24 Name of contact and telephone number for queries Michael Anscombe - 01293 767676 25 Name and signature of authorised company official Responsible for making this notification Date of notification - 26 March 2003 Michael Anscombe Assistant Company Secretary London Stock Exchange, Company Announcements Office, Old Broad Street, London EC2N 1HP Facsimile: 020 7588 6057, 020 7334 8964/8965/8966 (PLEASE DO NOT POST) Enquiries: Continuing obligations: Telephone: 020 7797 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 March 2003____ By ____/s/ Luke Thomas____ (Signature)*