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I don't think this can be an Ectemnius species as Ectemnius are wood burrowers, and also there are a number of other features that are wrong.
I am not an expert in these by any means, and I haven't been able to come up with any reliable alternative at all - very sorry!
I'll keep looking, very good pictures by the way!
Thanks for the comment. I agree, and further to this, I have re identified it (with assistance from World museum in Liverpool) as Mellinus arvensis.
Lat/Lng: 53.293108, -3.011547
OS grid ref: SJ326778