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Thanks all. I think a friend did manage to catch this and it is currently being looked at by someone more expert than I. I'll post here the ID if it gets sorted.
Biodiversity Officer - Shropshire
I'm fairly certain this is C. arcuatum and not C. cautum. The third antennal segment looks to be longer than the combination of segments 1 & 2.
Lat/Lng: 52.44856, -2.98438
OS grid ref: SO331838