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Thank you for all the advice on this......I now have very few wasps and can sit in my secret corner in peace..
I decided against a spray because of the hedgehogs and frogs......one hog may be living under the decking...
The artificial nest didn't work for me. I made half a dozen traps with various drinks inside.....they loved the Kir and it's fun to watch squiffy wasps staggering in circles.....
I slipped three small pieces of wood down between the fence and decking where I thought they were entering the nest and kept those well sprayed with WD40 and Cif......they really hate both.....
I gathered hundreds in the bottle traps....and sad though I am that I had to kill them they were vicious and unprepared to share my garden.....
Thank you again....x