The benefit of heat pumps is substantially less in the UK V's France. They are expensive in the winter as you have to rely on emersion heaters when there is not enough heat in the air. If I was going to spend some cash investing in green tech, this would not be it. My opinion is that we should be looking at solar panelling first. Anything after should be used on closing the oil burning power stations we have running.
you don't need emersion heating for space heating, but you will likely need a hot water tank for water heating for showers, etc
"not enough heat in the air" is nonsense, heatpumps are standard issue kit in Scandinavia
we barely burn any oil in the UK. Total installed capacity is ~370MW and is basically never used - see https://electricityproduction.uk/plant/oil/
** The coal plants are nearly gone too, we do burn an absolute shit load of gas however, and that definitely needs reducing.
Heatpumps are not a one size fits all solution, and they are very expensive, that much is true.
If you watch the video he points out why it works in those countries. They have learned to live in a cold country by building housing to suit. We have not done this because we burned cheap coal instead. All those older housing is not up to scratch. One thing you cannot get away from is the noise. We live with a much smaller land foot print than they do in Scandinavia.
You are right about the oil though. I should have said fossil fuelled. I will edit it.
I am also speaking from experience. My sister took advantage of the scheme. They are very underwhelmed. I am never said there is no benefit. I think there are better gains in other areas.