The pair admitted that they were in breach of the rules concerning misleading racecourse stewards and those covering involvement with flapping horses.
Pretty Average was a well-backed 20-1 winner of a selling handicap on 29 July last year for trainer Basil Richmond, who was cleared of any breach of the rules prior to the inquiry.
An involvement with flappers usually carries a penalty of disqualification from ownership for 12 months. But the Jockey Club's director of public affairs, David Pipe, said: "The stewards viewed this as an extremely serious offence."Reuse content