Hello and welcome. 
By "not legal tender", I assume you mean coins from other pound-using territories (Jersey, Gibraltar, Falklands etc)?
If so, then the answer is "yes" - it's pretty normal, wherever you are in the world, to find foreign coins in change. Especially if the foreign coins have a more-or-less identical size and shape to local coins.
Here in Australia, for example, we often find coins of our Pacific neighbours. Americans often find Canadian coins, and vice-versa. And I don't know if Thai 10-baht coins are still turning up in change in Euroland, but I know they used to be a big problem there.
By "not legal tender", I assume you mean coins from other pound-using territories (Jersey, Gibraltar, Falklands etc)?
If so, then the answer is "yes" - it's pretty normal, wherever you are in the world, to find foreign coins in change. Especially if the foreign coins have a more-or-less identical size and shape to local coins.
Here in Australia, for example, we often find coins of our Pacific neighbours. Americans often find Canadian coins, and vice-versa. And I don't know if Thai 10-baht coins are still turning up in change in Euroland, but I know they used to be a big problem there.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis



















