I think we have a winner!
Likes chalk soil, sits on dung, eats grasshoppers (there were loads about)...
And funnily enough, when I first glimpsed it, the first thought I had was, 'Ooo...was that a hornet?'
I recommend this book - OK, it doesn't cover the (nearly) 25,000 GB and Ireland insect species (it covers 1,653 species), but it will usually get you to the right family that you can then look for online.