& 43 Vict. c. 76 (An Act to amend the Law with respect to the Liability of Members of Banking and other Joint Stock Companies) (15th August 1879)

Provided always, that no part of such increased capital shall be capable of being called up, except in the event of and for the purposes of the company being wound up.

And, in cases where no such increase of nominal capital may be resolved upon, an unlimited company may, by such resolution as aforesaid, provide that a portion of its uncalled capital shall not be capable of being called up, except in the event of and for the purposes of the company being wound up.