Seeing as we're going off piste...
Heat pumps are certainly not perfect, but a house with a heat pump and 2kw of PV will have about the same energy costs as a house with a gas boiler.
The temperature output from a heat pump is lower than a boiler. That would indeed mean that larger radiators are required. As it is, the radiators in a lot of older homes are oversized anyway (because they were sized based on single glazed windows and very little loft insulation), so an upgrade isn't always necessary. On new builds, there is the option for underfloor heating or radiators with more panels, but the insulation in new builds now means that they barely need heating anyway.
Heat pumps are being pushed because it is possible to run them at zero carbon if you have a lot of PV, especially with storage. Even if you don't, the de-carbonisation of the grid means that electricity produces less carbon than gas. There is a separate question of whether it's necessary to reduce carbon in the first place, but that's a further tangent that we should probably avoid.
It is not true that heat pumps require more insulation. The effect of heating the air through radiators is constant regardless of the heat source. The oversizing of radiators is what is required to get the heat into the air in sufficient quantities.
Finally, they put out the idea of an 80mph speed limit and it didn't make much of a splash. Apathy= not vote winning so they didn't bother.
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