I think it's going to vary a lot by neighbourhood and type of house. A lot of houses in London now have wood burners for fashion more than necessity, go take a look at houses for sale in Walthamstow and see how long it takes you to find one proudly displaying a wood burner as a lifestyle accessory in an £800k house. If you whack wet wood in one of these you're going to be polluting the air for hundreds of people living nearby. In a dense urban area it's obvious when someone is burning poor quality fuel because it just spills straight out of the top of their home, so I can't see that enforcement would be too hard there.

Some people will have problems, canal boat dwellers are often dependent on wood burning for heat and many will probably just continue burning wet wood. Still, there are loads of middle class house dwellers with a fashionable cozy fire as well as a gas boiler. Those people should just buy decent quality fuel.

Compared to the USA the UK is super dense and most people live in towns and cities.

Aaah yes, the 20mph quantum speed. Quantum because it's simulteneously outrageously, recklessly fast (when cycled), and unbelievably, unreasonably slow (when someone tries to set or enforce a 20 limit, or a driver is stuck behind a cyclist doing 20).