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This beetle was about 5-6 mm in length. I hoped it was larch ladybird but probably not.
Thanks, but I don't think Nalassus laevioctostriatus is correct. That species seems to have pronotum and elytra same colour, whereas my beetle is distinctly two-tone.
Isomira murina has been suggested to me and that seems a close match. Other species in that genus are also similar but I. murina seems to be the only British one.
Lat/Lng: 52.11627, -0.26639
OS grid ref: TL187478