Had an email from Betfair. You can now deposit winnings even if you have hit your deposit limit. So if you have a monthly limit of £20 and you add that to your account. You then win £50 and cash out. You can then deposit £50 because your depositing winnings so your limit is net. Not sure if other casinos/betting sites are doing this. I understand people will say your not loosing any more money as your depositing winnings.