Noun
recorded delivery (uncountable)
A form of postal delivery where the sender receives a receipt of postage, and the receiver must sign upon receiving it
In the United Kingdom recorded delivery mail (branded as signed for by the Royal Mail) is covered by The Recorded Delivery Services Act 1962. Source: Internet
Under this legislation any document which its relevant law requires service by registered post for example documents served under The Law of Property Act 1925 can also be lawfully served by recorded delivery. Source: Internet