i was expecting some scientific answers on the flies - maybe the huge increase in rape in the UK is encouraging them?
with regard to the comment about about bugs having no performance impact that is incorrect. High performance sailplanes are often fitted with in flight bug wipers and performance tests have been carried out highlighting the benefit.
having bugs on the wings must impact the laminar flow and thus reduce the lift produced requiring more throttle - maybe though its a negligible amount? - any boffins out there care to comment?