Any regulations made or other thing done under section 4 of the M1London Hackney Carriages Act 1850 by or on behalf of a Commissioner of Police of the Metropolis and in force or otherwise having effect immediately before the coming into force of paragraph 2 above shall have effect as from the coming into force of that paragraph as if made or done by or, in the case of a signature, by a person authorised for the purpose by, Transport for London.