See s.4 (and s.4A, but this was inserted by 1996 Act so is irrelevant to your query).
By s.4(3), "disposal" means creation or transfer of an estate or interest. I take this to demand a Deed rather than a contract; s.4Aproves my case, by applying s.4 to a contract (i.e. s.4 does not otherwise apply to a contract).
The Act does not directly link to LRA 2002, so it must be the date of the Deed (not registration of title) that counts.
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