Where one spouse F1or civil partner is entitled by virtue of section 31 to a registrable charge in respect of each of two or more dwelling-houses, only one of the charges to which that spouse F1or civil partner is so entitled shall be registered under section 31(10) or under section 2 of the M1Land Charges Act 1972 at any one time, and if any of those charges is registered under either of those provisions the Chief Land Registrar, on being satisfied that any other of them is so registered, shall cancel the registration of the charge first registered.