The two British species with red pronotum are O. melanopus and O. duftschmidi ( = rufocyanea on the last British checklist, but apparently not the "true" O. rufocyanea according to the latest revision).
Both are widespread in Britain, and O. duftschmidi is probably under-recorded because it's easily mistaken for O. melanopus.
Dissection required!
The characters are all nicely illustrated in this revision by Bezdek & Baselga, 2015.
(Michael Geiser)
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