665. In the event of the winding up of a company that had been an unlimited company before it re-registered under this Act as a private company limited by shares, the following provisions have effect:

(a) notwithstanding section 1278(2)(a), a past member of the company who was a member thereof at the time of re-registration shall, if the winding up commences within the period of 3 years beginning after the day on which the company is re-registered, be liable to contribute to the assets of the company in respect of its debts and liabilities contracted before that time;

(b) where no persons who were members of the company at the time of re-registration are existing members of the company, a person who, at that time was a present or past member thereof shall, subject to section 1278(2)(a) and to paragraph (a), but notwithstanding section 1278(2)(c) be liable to contribute in the foregoing manner despite the fact that the existing members have satisfied the contributions required to be made by them in pursuance of this Act; and

(c) notwithstanding section 655(2)(a), there shall be no limit on the amount which a person who, at the time of re-registration, was a past or present member of the company, is liable to contribute in the foregoing manner.