the dispute for determination in accordance with the Dispute Resolution Procedure set out in Clauses 18.1 to 18.6
SERVICE OF NOTICE
Save as otherwise specified in the Contract or where the context otherwise requires, any notice or other information required or authorised by the Contract to be given by either Party to the other Party must be in writing and may be served:
by post, or in the case of any notice served pursuant to PART 16 (Variation) and PART 17 (Termination), registered or recorded delivery post;
by telex, or facsimile transmission (the latter confirmed by telex or post);
unless the context otherwise requires and except in Clause 16.1 electronic mail; or
by any other means which the PCT specifies by notice to the Contractor.
Any notice or other information shall be sent to the address specified in the Contract or such other address as the PCT or the Contractor has notified to the other.
Any notice or other information shall be deemed to have been served or given:
if it was served personally, at the time of service;
if it was served by post, two (2) Working Days after it was posted; and
if it was served by telex, electronic mail or facsimile transmission, if sent during Core Hours then at the time of transmission and if sent outside Core Hours then on the following Working Day.
Where notice or other information is not given or sent in accordance with Clauses 23.14 to 23.16, such notice or other information is invalid unless the person receiving it elects, in writing, to treat it as valid.