There are two ATM's that pay out Sterling in Calis. One is one of the group of three at the top of the main street near the taxi rank. It's the green Garanti Bank machine. However, in the last week two cards belonging to British people have been cloned and both parties where alerted by their Banks who stopped the cloned cards being paid out. So be warned if you use this machine to check if it has been tampered with, apparently something was inserted in the card slot to copy cards.
The second machine that pays out Sterling is at the water taxi bridge on the prom side. This machine has recently been re-furbished and no longer has a door. However, it is not as remote as the other machines as people pass by all the time. However, no guarantees. So please be careful.