Detectives arrested another jockey today in connection with an on-going race fixing inquiry.
The jockey was held in Cumbria on suspicion of conspiracy to defraud and is being questioned by officers from City of London Police.
Twenty-seven people remain on police bail to July 3 in connection with the inquiry.
The police investigation – codenamed Operation Crypton – is Britain’s largest ever horse racing corruption investigation.
It has been hanging over racing for two years but any decision on charges will be delayed until at least the summer.
The police inquiry has been looking at more than 80 races and more than 130 officers have worked on the case. At least 19 addresses have been raided.
The most high profile jockey arrested and bailed in the probe was Kieren Fallon who is confident he will ultimately be cleared of any wrongdoing.
Half a dozen other jockeys and trainers have also been arrested but not charged.
The police swoops followed irregular betting on the internet exchange Betfair which allows punters to “lay” horses – effectively they act as the bookmaker taking bets from other online gamblers.
It is claimed that the system opens up the possibility that an unscrupulous jockey on a highly fancied mount could be paid to lose and a gambler “laying” the horse on Betfair would win.
Betfair passed records from its sophisticated tracking of betting patterns to the Jockey Club which in turn called in the City of London Police which has the country’s largest financial fraud investigation team.