Term over three years: must be made by deed (s 52(1) of the LPA 1925).
Three years or less: may be created by parol (s 54(2) of the LPA 1925).
Assignments of leases: must be made by deed regardless of the term. (Crago v Julien (1992))
Require a valid contract: s 2 of the LP(MP)A 1989 or s 40 of the LPA 1925 if created before 26 September 1989.