Mindy Chen-Wishart. Contract Law (2018 6 edn). p 121. I read Law of Property Act 1925 s(205)(1)(xxi) quoted, but still don't understand (ii).
(xxi) “Purchaser” means a purchaser in good faith for valuable consideration and includes a lessee, mortgagee or other person who for valuable consideration acquires an interest in property except that in Part I of this Act and elsewhere where so expressly provided “purchaser” only means a person who acquires an interest in or charge on property for money or money’s worth; and in reference to a legal estate includes a chargee by way of legal mortgage; and where the context so requires “purchaser” includes an intending purchaser; “purchase” has a meaning corresponding with that of “purchaser”; and “valuable consideration” includes marriage [F6, and formation of a civil partnership,] but does not include a nominal consideration in money;