London chimneys

We drove up to North Lindon today to visit our son and partner- they have moved into a lovely flat with a great view . It struck me how many chimneys were on each rooftop- no wonder the city used to be thick with smog!
Isn't driving around London just the pits!! I was even relieved when we got back onto the M3 which is saying something! I hope you have all had a lovely weekend.