In its application to existing companies, this Act applies in the same manner—
in the case of a limited company (other than a company limited by guarantee), as if the company had been formed and registered under Part I of this Act as a company limited by shares,
in the case of a company limited by guarantee, as if the company had been formed and registered under that Part as a company limited by guarantee, and
in the case of a company other than a limited company, as if the company had been formed and registered under that Part as an unlimited company.
But reference, express or implied, to the date of registration is to be read as the date at which the company was registered under the Joint Stock Companies Acts, the Companies Act 1862, the Companies (Consolidation) Act 1908 the Companies Act 1929, or the Companies Act 1948.