Yes you can but there are risks involved. If a bookie realises what you are doing they may cancel bets you have placed with them which could cost £100's.
This has happened to me, I just took it on the chin and moved on. I have made 20 times what I lost on that one account. The important thing is if you get caught, you can't complain. You know what you are doing is against the terms and conditions. I wouldn't advocate it as I wouldn't want anyone blaming me but I do it all the time
"All you need to ask yourself is do you feel lucky? Well do you......Punk!"