Hi - they need to prove that the lease has come to an end (determined) if that is indeed the case. If they have 'nothing' then invariably they will have to rely on a statement of truth (the facts as they know it)
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PG 26 explains how leases can be determined and what's required in any given scenario. The conveyancer should be aware and able to put together a suitable application to then apply to cancel the noted lease. But it will rely on the seller to assist with knowledge of the facts for example