Any enactment which requires or authorises a document or other thing to be sent by first class post (whether or not it makes any other provision in that respect) shall be construed as if it required or (as the case may be) authorised that thing to be sent by a postal service which seeks to deliver such documents or other things by post no later than the next working day in all or the majority of cases.

Any enactment which makes any other provision in relation to the sending of a document or other thing by first class post or to a thing so sent shall be construed as if it made corresponding provision in relation to the sending of that thing by a postal service which seeks to deliver such documents or other things by post no later than the next working day in all or the majority of cases or (as the case may be) to a thing sent by such a service.