If the infestation is biblical—like, you’re naming individual flies—buy a Fruit Fly Zapper. It’s a small device with a UV light and a fan. It sucks them in and zaps them onto a sticky board. It’s the electric chair for tiny pests.
You can get them on Amazon or at any decent hardware shop. Or just search "fruit fly trap" in any UK supermarket. They cost about a fiver. That’s less than the price of a single avocado you probably forgot to eat.
