No, not any longer. The last British coins minted in coin rotation were the Victorian silver coins of 1887. Notably, the 1887 Halfcrown, Florin, Shilling, Sixpence, Threepence and the Maundy coins....
You can either try to exchange them at a bank, or at a currency exchange place in a mall, or in an airport, although most currency exchanges won't take coins. Most banks will likely send you away...
ALL coins are "minted" coins because they're made at a mint. They are never pure silver or gold. US silver coins used to be 90% silver with some 10% copper added to make them harder so they wouldn't...
If you mean a dollar coin made in 1935 or before that are the only real silver dollars, mintmarks (letters) are used to show the Mint a coin was struck at. A coin with no mintmark was struck at the...