55.—(1) Where proceedings are started, the economic operator must serve the claim form on the contracting authority or utility within 7 days after the date of issue.
(2) Paragraph (3) applies where proceedings are started—
(a)seeking a declaration of ineffectiveness; or
(b)alleging a breach of regulation 48, 56 or 57(1)(b) where the concession contract has not been fully performed.
(3) In those circumstances, the economic operator must, as soon as practicable, send a copy of the claim form to each person, other than the contracting authority or utility, who is a party to the concession contract in question.
(4) The contracting authority or utility must, as soon as practicable, comply with any request from the economic operator for any information that the economic operator may reasonably require for the purpose of complying with paragraph (3).
(5) In this regulation, “serve” means serve in accordance with rules of court, and for the purposes of this regulation a claim form is deemed to be served on the day on which it is deemed by rules of court to be served.