I don't carry much in the way of cash, and recently I had accumulated £500, in my back pocket, so I decided to try to bank most of it, using the local Post Office. Young girl behind counter, I gave her £400, she counted it, booked it in, I swiped my TSB card in their reader, typed in the pin - DECLINED. The girl thought, maybe too large an amount in cash, and so tried again with £200 - again DECLINED appeared on the screen. I'm pretty certain \i got the pin correct, but what might the DECLINED mean?