The Land Registration Rules 2003

First registration application where title documents are unavailable

27.  An application for first registration by a person who is unable to produce a full documentary title must be supported by evidence—

(a) to satisfy the registrar that the applicant is entitled to apply under section 3(2) of the Act or required to apply under section 6(1) of the Act, and

(b) where appropriate, to account for the absence of documentary evidence of title.