So, I have at least 15 different types of currency I want to change into Sterling.

Any ideas other than driving to the nearest international airport and annoying the Bureau De Change?

If you have large quantities, then yes Bureau de Change (Post Office have reasonable rates for large quantities, M&S seem to offer good rates for smaller quantities, I’m sure others will recommend other providers). If you only have small amounts of coins, give them to charity? Post Office I think donates to Barnados, M&S to Breakthrough Breast Cancer, I am sure there are others.

give them to charity?

How do you think I have 15 different types of currency 🙂

I can see a phone call and some blagging in my near future. Either that or a basic bank account somewhere that does zero commission buy back.

is it coinage ? if so you might be out of luck – and looking for someone more specialist than your local buraeu de change.

is it coinage ?

Yep

if so you might be out of luck

You may be right

and looking for someone more specialist than your local buraeu de change.

Looking likely

Whilst Im at it, what about old UK coins, like the old style 50p’s?