Where the purposes of a term of years, created or limited out of leasehold land, are satisfied at the commencement of this Act, that term shall merge in the reversion expectant thereon and shall cease accordingly; but where the term was vested in the owner of the reversion, the merger and cesser shall take effect without prejudice to any protection which would have been afforded to the owner for the time being of that reversion had the term remained subsisting.

Where the purposes are satisfied only as respects part of the land comprised in a term, this provision has effect as if a separate term had been created in regard to that part of the land.