Perhaps shows the state of Britain's economy/relative worth compared to the rest of the world, since I used them (true, only occassionally) late 90s/early 2000's, but they must be worth much much less now, due to inflation, not to mention that referendum thing. It's not because prices are low in Britain aka Treasure-Island, that's for sure!

$100 bills are more than common, for example, and similar (actually quite a bit more) in value.