I am sure you are familar with section 117 but just so we are clear,
117 Bringing down encumbrances on registration of new lease
(1)Where upon the registration of a lease—
(a)the Registrar is satisfied that—
(i)it is in renewal of or in substitution for a lease previously registered; and
(ii)the lessee is the person registered as the proprietor of the prior lease at the time of the registration of the new lease or at the time of the expiry or surrender of the prior lease, whichever is the earlier, or the personal representative of that person; and
(b) the lessee or the registered proprietor of any encumbrance or lien or interest to which the prior lease was subject at the time of its expiry or surrender or the personal representative of the registered proprietor so requests,—
the Registrar shall state in the memorial of the new lease that it is in renewal of the prior lease or in substitution for the prior lease, as the case may be.