the fact that the poison was used as mentioned in the proviso to section eight of the M1Protection of Animals Act, 1911, or the proviso to section seven of the M2Protection of Animals (Scotland) Act, 1912, shall not be a defence in proceedings under paragraph (b) of either section if the poison was used in contravention of the regulations; and

any person convicted in such proceedings of an offence committed by or in connection with the use of the poison in contravention of the regulations shall be liable to a fine not exceeding fifty pounds or to imprisonment for a term not exceeding three months or to both.