Being "restricted" by the online bookies is nothing new.
I am restricted to 10p-50p bets on WH, Ladbrokes, Paddy, Victor, Fred, Marathon, Betway, Betfair SportsBook, Coral and restricted to £5 bets on 365. I can still use the exchanges as they don't give a monkeys if you have an unfair advantage as they get paid either way.
If they suspect you are "arbing" or match betting they will first stop the free bets offers and if you continue to be "non profitable" to them they will simply restrict your acount to tiny bets. The bookies go to some extremes to catch people, a cookie called iesnare is one way.
The Gambling Commision can do absolutely nothing about this - it's in the bookies T&Cs that they can refuse any bet.