Where on a summary trial in England or Wales of an information for an offence under Part II or III of this Act—
(a)it is proved to the satisfaction of the court, on oath or in a manner prescribed by rules made under section 15 of the [1949 c. 101.] Justices of the Peace Act 1949, that a requirement under subsection (1) of section 70 of this Act to give information as to the identity of the driver of a particular vehicle on the particular occasion to which the information relates has been served on the accused by post; and
(b)a statement in writing is produced to the court purporting to be signed by the accused that the accused was the driver of that vehicle on that occasion,
the court may accept that statement as evidence that the accused was the driver of that vehicle on that occasion.