http://www.legislation.gov.uk/id/apni/1963/5

http://www.legislation.gov.uk/apni/1963/5/section/4/2006-01-01

Recorded Delivery Service Act (Northern Ireland) 1963

An Act to authorise the sending by the recorded delivery service of certain documents and other things required or authorised to be sent by registered post; to authorise notices under the Eviction (Ireland) Act 1848 to be sent by the recorded delivery service; and for purposes connected with those matters.