About 10mm long.
No interactions present.
I think it might well be an Ichneumon or Vulgichneumon sp., based on the similarity of colourng to several species, but there are certainly other options... and I've not seen any yet with quite such dark legs. I'm sure it's in that group, though (Ichneumonini).
Lat/Lng: 51.540316447216, -0.32921433448792
OS grid ref: TQ159837