(1) Regulation 2 of these Regulations applies—
(a) in so far as it amends regulation 3(1)(aa) of the principal Regulations, where the month referred to in that provision commences on or after 1st April 1987;
(b) in so far as it amends regulation 9(5) of the principal Regulations, where the application referred to in regulation 9(1) of those Regulations is received on or after 1st April 1987;
(c) in so far as it amends Schedule 2 to the principal Regulations, where the examination or first examination leading to the supply of an appliance takes place on or after 1st April 1987;
(d) in any other case, to drugs and appliances supplied on or after 1st April 1987.