3.—(1) Subject to Articles 4, 5 and 6, a large shop shall not be open on Sunday for the serving of retail customers.
(2) If paragraph (1) is contravened in relation to a shop, the occupier of the shop shall be guilty of an offence and liable on summary conviction to a fine not exceeding £50,000.
(3) Where a person is charged with having contravened paragraph (1), in relation to a large shop which was permitted by virtue of the exemption conferred by paragraph (1) of Article 5 to be open for the serving of retail customers on the Sunday in question during the hours mentioned in that paragraph, by reason of his having served a retail customer after the end of those hours, it shall be a defence to prove that the customer was in the shop before that time and left not later than half an hour after that time.