I've had issues with the Barclay's ATM, specifically the lower down one one on the corner. On two occasions it retained my card, luckily I got it back each time and no dodgy transaction were noted afterwards. Suffice to say I don't use either of them anymore. Completely agree with shuntman in using the ATM inside the banks however regarding point number two, if I saw anything attached to an ATM I've been told not to remove it as it may be being watched, would report it to staff within the bank, providing it's open...