21nova roulette betting amount question?

So basically I am considering signing up to 21nova to play roulette and blackjack a little for fun (damn cruising - it got me hooked! lol) but I was just wondering what the minimum and maximum bet for both roulette and blackjack are, so i can decide if it's worth it or if i have no chance of even winning back a few pounds. I'll be using the UK site, so preferably in pounds please.