land has been possessed by any person, or by any person and his successors, for a continuous period of twenty years openly, peaceably and without any judicial interruption; and

the possession was founded on, and followed the execution of, a deed (whether F2 or not registered or recorded ) which is sufficient in respect of its terms to constitute in favour of that person a real right in that land, or in land of a description habile to include that land, then, as from the expiry of that period, the real right so far as relating to that land shall be exempt from challenge except on the ground that the deed is invalid ex facie or was forged.

to the real right of the lessee under a lease; and

to any other real right in land, being a real right of a kind which, under the law in force immediately before the commencement of this Part of this Act, was sufficient to form a foundation for positive prescription without the deed constituting the title to the real right having beenF3registered or recorded,