Blue flag , you just make use of reloads and refund bets , you basically bet and lay a bet that loses you pennies and you get a refund bet from the bookie which you then use to make money , the videos explain it all.
I'm in the same boat as you , I've had loads of bookie accounts , but there are plenty of sign ups , just be careful with the casino ones , they can close the loop holes very quickly and you can get your money stuck and end up having to argue to get it back .