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Pesky flies!
I have a new greenhouse and I have had a particularly unpleasant problem which I did not expect to have to deal with. Lots, and I mean LOTS, of flies come into the GH and can't find their way out. They eventually die and create a nasty mess all over. It's really rather horrid, not least for the insects, which includes bees, butterflies and moths.
Does anyone have any bright ideas of what to do. Fly paper wouldn't cope with the large numbers and the design of the GH ( square with a high apex) doesn't allow their escape. 
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Thanks waterB. but there is no window in the roof which is the main problem. lots of windows and door to let them , but they go up and can't get out.
My only idea is to place a bright light at ground level outside the open door to lure them out at night. Do you think this might work?
try a catapult with small stones
I would place the light outside at ground level by the open door. Moths would be attracted but hopefully not to go inside. Will look into the fly screen idea but am reluctant to drill into the structure to secure the blinds. Thinking caps back on.....
Good point, thanks WB.
I once lived in a house that was plagued by flies. After talking to the old boy down the road we hung bunches of elderberry leaves in the window. Voila! No flies
What a lovely natural idea, Adam...... Will try it.
You could also try lemon or lavendar. We had a big problem a few months ago with big black flies using downstairs for aerial display practice & the bay window looked like a kamikaze fly central.
Switched kitchen cleaner to a lemon one, planted lavendar in window boxes & got a lavendar room scent. Not a single fly since.
Basil is another natural option.
Interested in the Lavender/Lemon/Basil/Elderberry comments, are flies put off by the smell?