Snipping a credit card

SIR – A recent letter (February 7) suggesting that one can drill a small hole in a credit card to disable it for contactless payments was too vague – where does one drill the hole, for instance?

Contactless cards have an aerial embedded around the perimeter, so one only has to cut off a small (8 mm long) corner of the card to make them unreadable to contactless card readers and to anyone attempting to read your card while it is still in your pocket.

The cut should be at the opposite end to the chip and the opposite side to the magnetic strip. Chris Cansdale Chesham, Buckinghamshire