Help identifying unknown (possibly silver) items - Celtic/pre decimal

Hiya!

I was looking for some help and as have had no luck whatsoever so far! These look like they should be part of larger sets but who knows!

There are five “celtic culture” pieces each with different Celtic imagery and coloured stones to one side, they weigh 47.5g and are 5cm across. the other three are “the pre Decimal coins of Great Britain” with Britannia head to one side and the other showing the history of the names coinage with gilded images, they weigh 51.7g and are 5cm across.

Any help gratefully received!!  

These may well be silver. Or not. The best thing you could do to identify them is to take those nice photos and do a Google image search with them. I'll bet real coins you get amazing results. Good luck! AY

Is there any information or hallmarks on the medal edges?