I recently ran out of charge in my mobile phone battery and had to phone home for a lift from my wife. I managed to locate a public phone in York railway station. I rummaged in my pocket for some change and deposited a ten pence piece in the slot. I then dialled the number and... nothing. I read the directions in case the procedure had changed since last I used a phone. It was then I read with horror that I needed to deposit 60 pence in the slot. No matter I thought, I'll only be a minute, I'll get 40 pence change. Wrong; it took the lot!