you limey's  will probably bite on this one ........ aerial combat with gnats, not your raf jet, the actual  bug!!   ya 

   we've got the annoying bastards & plenty of them. all fruit/ veggies are fridged.  just for kicks i told my wife to google "how to kill gnats. she came up w/this!! & they both  work!!
 method 1 -  vinegar in bowl w/ saran wrap. rubber band around bowl w/ saran wrap tight. poke holes in wrap big enough for the little s.o.b.'s to crawl in, empty & change every other day.
method 2 - hairspray, yes hairspray!! it weighs down their wings &  they crash like a a fokker in a silent old ww 1 dogfight movie scene. i need to get a life!! 
 
   
  