Service on a limited company may be effected —
(a) by leaving the claim form at the registered office of the company;
(b) by sending the claim form by courier, prepaid post or authorized electronic means, addressed to the registered office of the company;
(c) by serving the claim form personally on an officer or manager of the company at any place of business of the company which has a real connection with the claim;
(d) by serving the claim form personally on any director, officer, receiver, receiver-manager or liquidator of the company; or
(e) in any other way allowed by any enactment.