We had a fitted sliding flyscreen on our Westfalia Amundsen PVC sliding door. It was always a bit stiff and awkward to use and the holes in the net stopped flies and mosquitos but let Scottish midges in. The strings in the corrugated net broke recently and I need to replace the whole thing. Is there any thing out there that is convenient to use, stops midges and costs less than the £350 (plus fitting) to replace the old one like for like. I know I am asking for the Holy Grail but does a simple effective flyscreen exist?