All decimal coins were minted at the Royal Mint and have no mintmark. All predecimal coins minted since 1932 were minted at the Royal Mint and have no mintmark. The Sovereign range of coins were usually minted where the gold was mined from. Apart from that, you would need to specify a year a denomination and what the coin appears to be made from.
All coins have been minted, minting simply refers to the striking of the coin. If a coin wasn't minted, it would just be a blank disc. Mint condition on the other hand refers to a coin with no wear on it at all, while all the other grades of coins have wear ranging from slight (about uncirculated) or a lot of wear (poor).