Thanks stonegloves - you are correct, it does look like a waterboatman (googled that first) and also whilst they don't look like they can fly, they apparently do.

A very interesting link also to the crop circles. I have been interested in the art/nature/whatever about crop circles for a few years now and overlooked this one on lucy pringle's page just moments before!

I guess I need to know when Waterboatmen fly to lay their eggs (they apparently fly to lay their eggs in other fields)