Unlike many other payment methods, bank wire transfers often incur fees. However, these fees will sometimes be taken care of by your bank. If you’re depositing to a UK-based casino from a UK bank account, you most likely won’t be subject to fees for that transfer. If you’re making a deposit to a foreign site, or in a different currency, then you should check with your bank about the commission for those transfers.
Withdrawals should be fee-free via this method too, although it is possible that some banks will charge. This depends on what bank the casino is using to transfer the withdrawal. There also may be commission charges if you’re moving a significant amount of money.