I find that there are very, very few bugs in Britain generally (except one day a year when we get flying ants, and some areas where there are midges). I grew up in France where we get mosquitoes in the summer, but they're nearly non-existent in Britain (definitely in NW England where I live).
Also, most windows only open a tiny bit (which annoys me because if it's warm I like to have air flowing into the house, and that's not possible here), so the rare bugs are unlikely to get in even without screens. But then it doesn't get warm. If it's 25C (77F), it's one of the hottest days of the year. I think the hottest it's *ever* been is 30C (86F).
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Also, most windows only open a tiny bit (which annoys me because if it's warm I like to have air flowing into the house, and that's not possible here), so the rare bugs are unlikely to get in even without screens. But then it doesn't get warm. If it's 25C (77F), it's one of the hottest days of the year. I think the hottest it's *ever* been is 30C (86F).