For the purposes of this Act, each of the following constitutes a relevant group of bodies corporate :
(a) a regulated body and its subsidiaries;
(b) an authorised NOHC (within the meaning of the Banking Act 1959 ) and its subsidiaries;
(c) an authorised NOHC (within the meaning of the Insurance Act 1973 ) and its subsidiaries;
(d) a registered NOHC (within the meaning of the Life Insurance Act 1995 ) and its subsidiaries.