Do Flies Mean Your House Is Dirty? We Asked A Professor

“It may be worth looking outside the home,” the expert said.

About a month ago, it began. When I walked into my kitchen for my morning coffee, I noticed tiny invaders: little black flies crowded around my (empty! bleached!) sink.

Panicked, I started looking around for the usual suspects: old food, an opened packet, a grubby bin.

But I found nothing. Though they’re not overwhelming, the little visitors have survived deep clean after frantic deep clean.

Across the UK, house flies are swarming. So, what does it mean – and does their appearance always signify a dirty home? Professor Adam Hart, a professor and........

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