18.—(1) No right of action to recover land shall be deemed to accrue unless the land is in the possession (in this section referred to as adverse possession) of some person in whose favour the period of limitation can run.

(2) Where—

(a) under the foregoing provisions of this Act a right of action to recover land is deemed to accrue on a certain date, and

(b) no person is in adverse possession of the land on that date,

the right of action shall not be deemed to accrue unless and until adverse possession is taken of the land.

(3) Where a right of action to recover land has accrued and thereafter, before the right of action is barred, the land ceases to be in adverse possession, the right of action shall no longer be deemed to have accrued and no fresh right of action shall be deemed to accrue unless and until the land is again taken into adverse possession.

(4) For the purposes of this section—

(a) possession of any land subject to a rentcharge by a person (other than the person entitled to the rentcharge) who does not pay the rentcharge shall be deemed to be adverse possession of the rentcharge, and

(b) receipt of the conventional rent under a lease by a person wrongfully claiming to be entitled to the land in reversion immediately expectant on the determination of the lease shall be deemed to be adverse possession of the land.