A notice may be given by the company to any member either personally or by sending it by post, to him or to his registered address, or (if he has no registered address within the United Kingdom) to the address, if any, within the United Kingdom supplied by him to the company for the giving of notice to him. Where a notice is sent by post, service of the notice shall be deemed to be effected by properly addressing, prepaying, and posting a letter containing the notice, and to have been effected in the case of a notice of a meeting at the expiration of 24 hours after the letter containing the same is posted, and in any other case at the time at which the letter would be delivered in the ordinary course, of post.