3.—(1) The principal Regulations shall continue to apply to—
(a)plans deposited or a building notice given in accordance with the principal Regulations before the commencement of these Regulations;
(b)building work carried out in accordance with such plans or such building notice with or without any departure or deviation from those plans or that building notice; and
(c)building work completed before the commencement of these Regulations,
as if the amendments effected by these Regulations had not been made.
(2) In paragraph (1)—
(a)“building notice” means a notice given under regulation A10 (Giving of notices and deposit of plans) of the principal Regulations; and
(b)“building work” has the same meaning as in the principal Regulations.