Although beetle like in appearance this is a member of the order Heteroptera (True Bugs)
which have mouth parts specialised for sucking sap.
Despite its name this Bug seems to have no association with Sloe (Blackthorn) and has never been found on it!
Main Food Plants are Raspberry (Rubus idaeus), members of the Rose family (Rosaceae) and
Elders, Honeysuckles and Viburnums (Caprifoliaceae).
Nymphs have been observed feeding on Black Nightshade (Solanum nigrum)