Top Sydney jockeys Peter Robl and Blake Shinn are expected to face serious penalties at end of this week after stewards laid charges against them relating to betting on races over a two-year period, including more than HK$2 million wagered through an account over just six weeks earlier this year. Shinn, 23, the 2008 Melbourne Cup winner, and Robl are among the leading riders in Sydney and also charged are Robl's wife, Elaine, a licensed track rider, and Shinn's mother, Carol, a licensed stable groom, as parties to the jockeys' offences. Shinn has been charged with placing numerous bets through his mother's betting account and both riders have been charged with placing bets through the account of Elaine Robl, with bets relating both to races in which the jockeys had rides and others in which they did not. Stewards produced evidence including voice recordings from telephone betting calls and CCTV footage from several off track betting outlets, which showed Shinn placing cash bets. Under Australian racing rules, jockeys are not permitted to bet on races, even if they are not riding in them. Shinn admitted to the inquiry that on one occasion he had bet A$2,500 (HK$19,285) on another runner in a race in which he was riding. His bet finished second, while his own mount finished fourth. There was a distant Hong Kong connection, too, when Robl admitted betting on horse which he rode, racecaller Apollo Ng-shung's Best Choice, when the horse won at Canterbury in September. Robl has also been charged with giving false and misleading evidence. Neither jockey has entered a plea and the inquiry is expected to reconvene on Friday. The last jockey penalised for similar charges in Australia was Danny Peisley earlier this year, when he was suspended for three months over placing bets on races. He was given another five months for backing a rival rider in a jockey challenge at a country track when Peisley was unable to make the weight for two of his rides and the jockey he backed replaced him on those mounts.