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, 2005

                                   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- ________ 


                                   SPIRENT PLC

                       NOTIFICATION OF 2004 FINAL RESULTS


London,  UK - 1 February  2005:  Spirent plc (LSE:  SPT;  NYSE:  SPM), a leading
communications  technology  company,  announces  that it intends to release  its
final  results  for the year to 31 December  2004 on  Thursday 24 February  2005
before the opening of the UK market.

The  Company  will host a results  presentation  at 09.00 UK time on Thursday 24
February  2005,  a webcast of which will be available on the Spirent plc website
at www.spirent.com from 15.00 UK time on that day.

An  analysts  conference  call will also be held at 16.00 UK  time/11.00  EST on
Thursday 24 February 2005.


                                    - ends -

Enquiries

Investor Relations
Catherine Nash                      Spirent plc             +44 (0)1293 767676

Media
Tom Buchanan/Rupert Young           Brunswick              +44 (0)20 7404 5959

About Spirent

Spirent is a leading  communications  technology  company  focused on delivering
innovative systems and services to meet the needs of customers worldwide. We are
a global provider of performance  analysis and service assurance  solutions that
enable the development and deployment of next-generation networking technologies
such as broadband services, Internet telephony, 3G wireless and web applications
and  security  testing.  Our  Network  Products  business  is  a  developer  and
manufacturer of innovative solutions for fastening,  identification,  protection
and connectivity in electrical and  communications  networks  marketed under the
global brand  HellermannTyton.  The Systems group comprises PG Drives Technology
which develops power control systems for specialist  electrical  vehicles in the
mobility and industrial  markets.  Further  information about Spirent plc can be
found at www.spirent.com

Spirent  Ordinary shares are traded on the London Stock Exchange  (ticker:  SPT)
and on the New York Stock Exchange (ticker: SPM; CUSIP number: 84856M209) in the
form of American  Depositary  Shares (ADS),  represented by American  Depositary
Receipts, with one ADS representing four Ordinary shares.

Spirent and the Spirent logo are trademarks or registered  trademarks of Spirent
plc. All other trademarks or registered  trademarks mentioned herein are held by
their respective companies. All rights reserved.

This press  release may  contain  forward-looking  statements  that are based on
current  expectations or beliefs, as well as assumptions about future events. By
their nature, forward-looking statements are inherently predictive,  speculative
and involve  risk and  uncertainty  because  they relate to events and depend on
circumstances that will occur in the future. You should not place undue reliance
on  these  forward-looking  statements,  which  are not a  guarantee  of  future
performance  and are subject to factors  that could cause our actual  results to
differ  materially  from those expressed or implied by these  statements.  These
risks include the risks described from time to time in Spirent plc's  Securities
and Exchange Commission periodic reports and filings.  The Company undertakes no
obligation  to update any  forward-looking  statements  contained  in this press
release, whether as a result of new information, future events or otherwise.


                                   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 __01 February 2005                    By   ____/s/ Luke Thomas____

                                                    (Signature)*