Regulation 79 Inference of condition of equipment at time of supply or putting into service
It is hereby declared that, in any proceedings in which it is in issue whether any applicable terminal equipment complied with the requirements of regulation 8 above at the time when it was supplied, put into service or connected to a public telecommunications network as the case may be, a court may infer that such equipment did not so comply at that time if—
it is proved that it does not so comply or did not so comply at a time subsequent to its having been supplied, put into service or so connected; and
having regard to all the circumstances of the case, it appears to the court that the failure of the equipment to comply at the time referred to in paragraph (a) above is not attributable to any cause arising subsequent to its having been supplied, put into service or so connected.