Here you go, Pete! As promised. Not the best shots, I’m afraid but quite a fascinating example all the same.
A once off, photographed way back in January 2015. Never seen it since.
After a great suggestion from Pete Hillman, I managed to dig around a bit and found a couple of sites that feature this wasp.
It is a pretty safe bet it is called Theronia Hilaris
Don’t you just love technology?