Gary Calder responds to an article by a Guardian Money reader who got even by stringing the fraudsters alongAnyone wishing to get their own back on bank-card scammers using the method described in your article (‘I’ve £80k in the account, here’s my pin’: turning the tables on the scammers, 29 August) might like to add a touch of realism to a made-up bank-card number by picking a known issuer identification number (the first six to eight digits) and ensure that the last digit conforms to the Luhn algorithm (it’s a check digit used to pick up errors in entering all the other digits). Further fun could be had by choosing an interesting postcode, such as SW1A 2AA (or 2AB – 10 and 11 Downing Street), SW1A 2JL (New Scotland Yard) or SL4 1NJ (Windsor Castle).Gary CalderChandler’s Ford, Hampshire• Have an opinion on anything you’ve read in the Guardian today? Please email us your letter and it will be considered for publication in our letters section. Continue reading...