During a recent visit to Lakenheath, Suffolk (click this link for the post on 'The Early Birder' blog) I came across this interesting Longhorn Beetle.
Golden-bloomed Grey Longhorn Beetle (Agapanthia villosoviridescens)
A large (up to 20mm long) and very distinctive longhorn beetle with the golden iridescent bloom on the elytra and thorax plus the long antennae with dark and light bands. It is a stem borer that breeds in the stems of thistles and other herbaceous plants.
Habitat: Mainly found in moist meadows and hedgerows. Adults feed on umbellifers such as Hogweed and Cow Parsley as well as on nettles.
UK Status: This beetle is fairly common in the south and east of England.