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Do you have a picture showing one of the insects in more detail. I'm sure you are right that it is hornet but from what is shown here there is not really enough to allow me to agree.
Thank you for your comment. I am new to this and just took pictures of the nest. It was in a portaloo in a nature reserve. There was a lot of activity and I did not fancy being stung!
Lat/Lng: 50.8916, -2.3847
OS grid ref: ST730103