One of the largest hoards of Roman coins ever discovered in Britain has been officially declared 'treasure' today. Amateur metal detecting enthusiast Keith Bennett discovered a total of 1,141 Roman denarii, or silver coins, in a field last July. The coins, stashed in a clay urn and buried around four feet underground, date from between 206 BC and 195 BC. [incorrect dates, the writer apparently should have said "AD" not "BC"] ...The coins will be valued by the British Museum and they will be worth a reasonably significant sum.' Mr Bennett, 42, who works at the central library in Leamington...