Patio Heaters didn't use to exist, now they do.
Never underestimate the profligacy bred by cheap energy.
As for lighting, we are a long way from having sunlight levels of illumination inside, so I think there is a long way to go before room illumination preferences top out.
There's been a fashion of having outside heating for some time now (circa 2000 was the chiminea, which was log burning, so something gas fired is better, as are the electric heater version), while they weren't as widespread as outside heaters are now, the use now still isn't all that prolific.
Even when people have them, their use is still relatively limited throughout the year. Whilst places like pubs and restaurants do have them and use them more widely, with the significant shift away from going out to drink among younger people their use could start to fall away again.
However, none of those are likely to be subject to an outright ban (possibly with the exception of we have a green party government), and if they are then only a fairly limited number of people would be impacted.
My guess would be that the collapse of petrol sales will cause range anxiety in the owners of petrol cars and drive custom back to diesel.
If the only fuel you can easily get hold of is diesel, people will buy cars that can use it.
Just as general aviation in some places has moved towards aviation diesels due to the difficulty in sourcing avgas in less developed areas.
But I guess the only way to tell is come back in twenty years and see what happened.
Indeed, the thing I would add, is it also depends on which petrol stations locally to you allow lorries (locally to me it's mostly motorway services, so that's quite a pain to go and fill up at) and how the switch to EV's goes for vans.
I suspect, however, that the numbers who are willing to keep buying diesel, just as they've thought through the process of fuel supply is likely to be limited. As such, the fall in diesel car sales is likely to continue on a downwards trend to the point that manufacturers start to drop them from their lineup (and possibly quite rapidly within a brand - especially those brands where they don't have the numbers being sold to make it worthwhile).
However, the rules around the end of the road for ICE's within cars is fairly fixed, so again is unlikely to change the outcome of the election.