51.—(1) Where—

(a) there has accrued to any person (other than a mortgagee) any right of action to recover land, and

(b) the person in possession of the land acknowledges the title of the person to whom the right of action has accrued,

the right of action shall be deemed to have accrued on and not before the date of the acknowledgment.

(2) Subsection (1) of this section shall apply to a right of action accrued to a person entitled to an estate or interest taking effect on the determination of an estate tail against whom time is running under section 19 of this Act, and on the making of the acknowledgment that section shall cease to apply to the land.