No justice shall act for any purpose under this Act, or under any of the Intoxicating Liquor Licensing Acts, except in cases where the offence charged is that of being found drunk in any highway or other public place, whether a building or not, or on any licensed premises, or of being guilty while drunk of riotous or disorderly conduct, or of being drunk while in charge, on any highway or other public place, of any carriage, horse, cattle, or steam engine, or of being drunk when in possession of loaded fire-arms, who is or is in partnership with or holds any share in any company which is a common brewer, distiller, maker of malt for sale, or retailer of malt or of any intoxicating liquor in the licensing district or in the district or districts adjoining to that in which such justice usually acts; and no justice shall act for any purpose under this Act, or under any of the Intoxicating Liquor Acts, in respect of any premises in the profits to which such justice is interested, or of which he is wholly or partly the owner, lessee, or occupier, or for the owner, lessee, or occupier of which he is manager or agent.
Any justice hereby declared not to be qualified to act under this Act who knowingly acts as a justice for any of the purposes of this Act shall for every such offence be liable to a penalty not exceeding one hundred pounds, to be recovered by action in one of Her Majesty's Superior Courts at Westminster :
Provided that—
(1)No justice shall be disqualified under this section to act in respect of any premises by reason of his having vested in him a legal interest only, and not a beneficial interest, in such premises or the profits thereof:
(2)No justice shall be liable to a penalty for more than one offence committed by him under this section before the institution of any proceedings for the recovery of such penalty:
(3)No act done by any justice disqualified by this section shall by reason only of such disqualification be invalid.