The provisions with respect to -

(a) the re-registration of an unlimited company as limited,

(b) the powers of an unlimited company on re-registration as a limited company to provide that a portion of its share capital shall not be capable of being called up except in the event of winding up, and

(c) the power of a limited company to determine that a portion of its share capital shall not be capable of being called up except in that event,

apply notwithstanding any provisions contained in any enactment, royal charter or other instrument constituting or regulating the company.