William Hill Australia in is quickly becoming the dominant horse race betting apps for punters in Australia. A few weeks ago we reported that they beat off stiff competition from CrownBet and SportsBet to win exclusive live streaming rights for all horse racing New South Wales. Now they've added a brand new innovative feature called "Double Down" that is available exclusively via their iPhone and Android apps. With Double Down if you pay a small fee of 10% on selected thoroughbred races you will be able to double your bet during a race at the same pre-race odds if you wish to. These means if you are watching live racing from Victoria or NSW via the William Hill app and your horse is in the lead, you can hit the "Double Down" button at any time and double your winnings. Remember that this feature is exclusive to iOS and Android devices. Full William Hill Mobile Review Here. FULL DETAILS: WILLIAMHILL.COM.AU