I work at a Sainsburys store and fortunately I have an understanding with my boss whom agrees than I can take any interesting coin from the till I find as long as I replace it.
Anyhoo, I thought I'd scan in and share with you what I had found.
As is my understanding; coins from the over sea territories of the UK are not legal tender in the UK, however coins from the UK are legal tender in the over sea territories. This rule is not really observed though as even from the bank I have been given coins from over sea territories.
A variety of differnt £1 coins and more...
None of these are particularly rare, but 1million Gibraltar pound coins in 5billion british pound coins could be seen as rare.