7At the end of the period specified in a general vesting declaration, the land specified in the declaration, together with the right to enter upon and take possession of it, shall vest in the acquiring authority as if the circumstances in which under Part I of the Compulsory Purchase Act 1965 an authority authorised to purchase land compulsorily have any power to execute a deed poll (whether for vesting land or any interest in land in themselves or for extinguishing the whole or part of any rent-service, rentcharge, chief or other rent, or other payment or incumbrance) had arisen in respect of all the land and all interests therein, and the acquiring authority had duly exercised that power accordingly at the end of that period.