When the Gallic Empire ended in AD 274, so did Britain’s supply of small change. So, over the next decade, British moneyers made their own small bronze coins – millions of them, says Dr Sam Moorhead – known today as ‘radiates’ from their radiate sun-crowns.

Barbarous radiate. c.3^rd/4^th century AD. Bronze unit. 12-14mm. 1.20g. Radiate head right./ Urn. Fine, rich earthy patina, clear head.                                                                   Was £25. Now only £15