As soon as you start betting £20 pound and above and winning regularly. Also if you withdraw the profit as soon as make it as leunt put it. Few times i had problems when i ask to withdraw the money sometimes it takes couples of hours sometimes up to next day. As soon as you withdraw £10,000 or more a week. Things will start to get a bit slow sometimes especially when you want to get out of the trade.
But generally binarybet is ok.
But i never had any problem when trading with small stake.