An authorised examiner may at any reasonable hour enter premises where used motor vehicles or trailers are sold, supplied, or offered or kept for sale or supply, in the course of a business and test and inspect any used motor vehicle or trailer found thereon for the purpose of ascertaining whether it is in any such condition as is mentioned in section 60(1) of this Act, and for the purpose of testing a motor vehicle and any trailer drawn by it may drive it and for the purpose of testing a trailer may draw it with a motor vehicle.
If any person obstructs an authorised examiner acting under this section he shall be guilty of an offence.
In this section an authorised examiner means a person who may act as an authorised examiner for the purposes of section 53 of this Act; and any such person, other than a constable in uniform, shall produce his authority to act for the purposes of that section if required to do so.
A motor vehicle or trailer shall be treated as used for the purposes of this section if, but only if, it has previously been sold or supplied by retail.