29. Bidding by seller or auctioneer or person on their behalf
(1) A sale by auction may be notified in the conditions of sale to be subject to the right by the seller or by any person on behalf of the seller or of the auctioneer to make a bid or a specified number of bids.
(2) A seller, and any person on behalf of the seller or of the auctioneer who makes, and any auctioneer who knowingly takes from any such person, ¾
(a) any bid at a sale by auction unless the right so to bid has been notified in the conditions of sale; or
(b) more than the number of bids so specified in the conditions of sale,
commits an offence.