Warning! Responding to banks’ requests that you inform them of all the business you do with them – which accounts you have, what cards – can seriously damage your health: in the wake of our last trip across the water, we hear of a friend that does plenty of business with Citibank and holds its Mastercard, who in the same week received two letters – one inviting her to apply for a no-fee Mastercard, the other asking her for her $20 subscription on her existing Citibank Mastercard – top marks to the bank though – when she called them up to say close my existing account and open one of the new free ones, after a very pause and a couple of steps up the ladder of responsibility, the supervisor told her No problem – don’t bother to close your account and open a new one – we’ll waive the $20 fee on your present card.