7.—(1) Where none of paragraphs 3 to 6 apply, a document may be served by—
(a)postal service;
(b)personal service.
(2) Where service is effected by personal service, the party executing service must lodge a certificate stating that the method of service employed is in accordance with the law of the country where service was executed.
(3) That certificate is to be given by a person who—
(a)practises or has practised law in that country; or
(b)is an accredited representative of that country’s government, conversant with the law of that country.