(1) This rule applies where a contract contains a term specifying how any proceedings under the contract should be served.
(2) A claim form containing a claim in respect of a contract may be served by any method permitted by that contract.
(3) If the claim form is served within the jurisdiction in accordance with the contract, it is to be treated as having been served on the defendant.
(4) If the claim form is served out of the jurisdiction in accordance with the contract, it is not to be treated as having been served on the defendant unless service out of the jurisdiction is permitted under Part 7.