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I think this is Grammoptera ruficornis, assuming it was small (less than a centimetre long)?
There's some good info about it on the Watford Coleoptera Group site:
(go to the Species page, scroll down to find family Cermabycidae, then look for Grammoptera under subfamily Lepturinae)
Entomologist and biological recorder
ok that great, thanks
Lat/Lng: 51.4, -2.6
OS grid ref: ST5970