4. Where, on or after 1st April 2002, appliances are supplied, or other general dental services are provided, in pursuance of a contract or arrangement for the provision of general dental services made before that date, the provision of regulation 4(5) of the National Health Service (Dental Charges) (Scotland) Regulations 1989 shall have effect in respect of that supply, or that other provision, as if regulation 3(3) of these Regulations had not come into force.