for small amounts maybe its best to get a status ac from HSBC, 70 QR a month one free transfer a month. However, their rate is higher that an exchange such as al sadd exchange. For small amounts al sadd exchange standard fee of 30-40 riyals results in a similar overall charge, banks charge higher exchange rates. For big amounts exchange is cheaper. Cheapest way is to buy a sterling cheque from the exchange cost 2-3 riyals and rely on the post to get to UK. Wait for delivery.