It's a shield bug nymph, perhaps Syromastes rhombeus (or a similar species).
Many thanks, Roy.
In reply to AndrewR:
It's a Dock bug nymph - Coreus marginatus. Final instar with those wing buds.
See here: www.britishbugs.org.uk/.../coreus_marginatus.html
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In reply to Rockwolf:
Rockwolf said:It's a Dock bug nymph - Coreus marginatus. Final instar with those wing buds.
That's an ID to trust over my suggestion Andrew!
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