The proviso added to the said section 43(1) by the [1958 c. 29.] Marriage Acts Amendment Act 1958, which prescribes a period of twelve months before a person may be authorised as aforesaid, shall not apply to any authorisation under this Schedule, and, if a sharing Church withdraws, in the circumstances mentioned in paragraph 3 above, from the sharing of a registered church building, the registration shall, for the purpose of the application of the said proviso to another building registered on behalf of the congregation of the withdrawing Church, be deemed to have been cancelled at the time of the withdrawal.