Those of you with good memories will recall that I have asked about UK suppliers of aluminium framed insect screens for windows. I've previously purchased the "loose mesh and velcro" types, but they're pretty rubbish. We had them for all the rooms in my last house, but had to leave them behind because they'd been cut to size. The supplier for them has long gone.
Some inspired Googling (motivated by the heat, I suspect) led me to these;
OK, they're in Germany, but the price isn't too bad (some places wanted 3 times as much) and delivery next week.
If anyone's interested, I'll post a review once it's come (I ordered one to see if they're any good. If so, I'll get some more) and I've put it together and installed it.