small chunks of ham floating about through the air.

- which is how East ham (in the East-end of London) got its name of course!

The "pea-souper", to which shona refers, was also know, in the C19, as "a London particular." It is a phrase whose originas I've never managed to unravel - I s'pose I'll have to LIU [ sigh ]

Certainly, the term "pea-souper" was common when I was at school, because we were sent home early when one occurred. I have been out in london fog where you could barely see your hand at the end of your outstretched arm - literally, "you couldn't see your hand in front of your face!" as the common expressionn had it. Crossing the road was an adventure and it was very easy to lose your way, even on familiar territory. Driving a motor vehiclae was a nightmare.
Then came the Clean Air Act, in the late '50s, I think, and within five years, thick fogs of that sort just did not happen.