Is this dangly thing associated with ladybirds (looking at the black and white spots).
No interactions present.
If you keep this in a cool dry place, the wasp should hatch out, and you will find what made the cocoon, and a more precise identification should be possible.
Thanks, might try to go back to see if i can find it again as it was right by the path. infact the georeference for it is accurate to within a couple of metres looking at the google earth image. so someone else might beat me to it!
unfortunately it had gone when i went back a week later
Lat/Lng: 51.9595, -0.639243
OS grid ref: SP935298