Welcome LGS
As 1949 says, try to sort them a little first, and then many of us on here can advise once you post some pics, especially of pre-1971 British coins. If most of them are in bags it does not suggest rarity or high value, but you never know. Any pre-1947 silver-coloured British coins will contain at least 50% real silver, so they wil be worth their silver content at a minimum