Some years ago, I took a routine trip into Guildford town centre to buy a couple of items I needed from our local Woolies. It was for the shop I had in the town at the time – Quarks Internet Cafe – so I had taken cash from the till to be replaced with the receipt and the change as was our usual practice.
It was a couple of small items and the bill was less than £5. I handed over a tenner and received my change which consisted of some coins and an Isle of Man £5 note. Now, only some people know that Isle of Man coins and notes are not generally accepted by retailers and are, technically, not legal tender in the UK. That said, most banks will exchange them for a UK equivalent. So, not a real problem in practice, but the point was I really would have liked my change in a format that the next shop would accept to save me going to a bank or going back to the shop at the other end of town.