Laccophilus minutus

At 4.6mm long, lacking a visible scutellum and clearly having 5 tarsal segments on its fore and mid tarsi, this keyed quite easily to Laccophilus. The size and absence of a stridulatory file on the hind coxae identified it as minutus. Most photos of this species I found online seemed to show paler and more strongly-patterned elytra but these are variable.

Laccophilus minutus showing process of close-up of elytral patterning and hind coxae, North Elmham (Norfolk, UK), 23rd August 2022

This one was also 4.6mm long and keyed to Laccophilus easily. The area where there should have been a stridulatory file had it been Laccophilus hyalinus wasn't entirely smooth (as Duff says it should be for minutus), but neither was there anything resembling a stridulatory file. Hackston descibes additional differences including in the microsculpture of the head and I think these supported the ID as minutus. The pattern on the elytra was much easier to see when an elytron was detached and viewed backlit.

Laccophilus minutus showing process of close-up of elytral patterning and hind coxae, North Elmham (Norfolk, UK), 23rd August 2022