A housefly trap in your car sounds like the sort of invention dreamed up after discovering a chip wrapper beneath the passenger seat three weeks too late.
Yet flies in cars are no laughing matter when you are trying to arrive at work without spending the entire journey swatting at something with the aerodynamic confidence of a fighter jet. A vehicle can become surprisingly attractive to insects. Warm upholstery, spilled drinks, food crumbs, damp floor mats and the faint aroma of yesterday’s takeaway can turn a perfectly respectable hatchback into a five-star hotel for flies.
The odd part is that …