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 SEPTEMBER, 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- ________










                                  SCHEDULE 11

          NOTIFICATION OF INTERESTS OF DIRECTORS AND CONNECTED PERSONS



1. Name of company


SPIRENT PLC


2. Name of director


ERIC HUTCHINSON



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 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)


N/A



5. Please state whether notification relates to a person(s) connected with the
director named in 2 above and identify the connected person(s)


N/A



6. Please state the nature of the transaction. For PEP transactions please
indicate whether general/single co PEP and if discretionary/non discretionary


N/A



7. Number of shares / amount of stock acquired


N/A



8. Percentage of issued class


N/A



9. Number of shares/amount of stock disposed


N/A



10. Percentage of issued class


N/A



11. Class of security


N/A



12. Price per share


N/A



13. Date of transaction


N/A



14. Date company informed


N/A



15. Total holding following this notification


N/A



16. Total percentage holding of issued class following this notification


N/A



If a director has been granted options by the company please complete the
following boxes.



17. Date of grant


26 SEPTEMBER 2003



18. Period during which or date on which exercisable


1 DECEMBER 2010 TO 31 MAY 2011



19. Total amount paid (if any) for grant of the option


N/A



20. Description of shares or debentures involved: class, number


24,721 OPTIONS UNDER THE SPIRENT SAVINGS RELATED SHARE OPTION SCHEME.



21. Exercise price (if fixed at time of grant) or indication that price is to be
fixed at time of exercise


EXERCISE PRICE OF 38 PENCE PER SHARE.



22. Total number of shares or debentures over which options held following this
notification


2,154,447



23. Any additional information


N/A



24. Name of contact and telephone number for queries


MICHAEL ANSCOMBE

ASSISTANT COMPANY SECRETARY

TELEPHONE 01293 767672



25. Name and signature of authorised company official responsible for making
this notification


MICHAEL ANSCOMBE

ASSISTANT COMPANY SECRETARY



Date of Notification


26 SEPTEMBER 2003



The FSA does not give any express or implied warranty as to the accuracy of this
document or material and does not accept any liability for error or omission.
The FSA is not liable for any damages (including, without limitation, damages
for loss of business or loss of profits) arising in contract, tort or otherwise
from the use of or inability to use this document, or any material contained in
it, or from any action or decision taken as a result of using this document or
any such material.


                                   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    September 26, 2003                    By   ____/s/ Luke Thomas____

                                                    (Signature)*