I have used it but something different. I am trying to learn to trade so I replay markets and hopefully I will learn something. Of course it will be totally different when I put down real cash, but this is an easier cheaper way to learn.
See attached screen shot of their interface.
I am not sure if it will work for you, but it will cost you 10 pounds to find out and 17cents per greyhound meeting which will work out to about 58 meeting for your 10 quid and more then 600 races if you choose the bigger meetings. This will give you real accurate betfair prices right before the off and will be good for your strategy if you want to work out true profitability.
Good Luck