The above is a regular occurrence... but this is a new one, I was trying to pay off £3.31 (the full amount) and it wouldn't let me. Eventually I found what the problem was, I had to enter the amount as "Minimum Payment" not "Full Amount" even though both figures were the same!
There were a number of other problems logging-on and completing the payment that almost had me giving up and paying by cash at the Post Office. Did I swear and bang my fist on the desk? Nope! My usual reaction is to just push on with gritted teeth and grim resolution. This time I was laughing, not the hysterical laughter of the man crushed by dysfunctional, bureaucratic and arbitrary forms, but genuine amusement at the ludicrousness of the situation. I guess it helped that at any moment I could say "bugger this" and go and pay at the post office.
I guess I should check what I bought for £3.31. I thought I was being so careful with money this month.