6. A notice or certificate under this Schedule may be given or issued by—
(a)handing it over to the person producing the relevant vehicle for examination or re-examination; or
(b)by sending it by pre-paid ordinary post addressed to the person who signed the application referred to in paragraph 2(a), and
shall be taken to have been given or issued at the time it was handed over or, as the case may be, put in the post.