Mine was a sarcastic dig at Remainers who were painting anything good in this country as a result of the EU.Not sure the Tories were ahead of the game. The Clean Air Act 1956 was a reaction to London’s Great Smog of 1952 and was a result of a Private Members Bill. Churchill was pretty slow to act on the Great Smog and his hand was rather forced.
That said, there had been some pollution control legislation as far back as early Victorian times, but it only covered industry.
The 1993 Clean Act replaced the 1956 legislation and embodied EU law.
Having gone to school on Teesside, I’m aware of the legislation.