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think it is likely to be Argogorytes fargeii or Gorytes laticinctus the later of which is apparently the rarest of the two but to my eye looks most like my photo ref. http://www.bwars.com/index.php?q=wasp/crabronidae/nyssoninae/gorytes-lat...
also looks like Argogorytes fargeii
Lat/Lng: 51.519833333333, -0.25716666666667
OS grid ref: TQ210815