You need to get out in the real world and see how a lot of people live in this country air source pumps are science fiction to a lot of people , I know people who still heat / hot water with just coal and wood . I deliver to people who answer to door in coats and gloves ,
Wood is cheap ( or free ) and won’t require thousands of pounds to install and maintenance costs , I doubt many air source pump systems will be able to heat a lot of old uninsulated homes well ?
In theory everyone would like to live in a warm , cheap to heat home , but the reality is very different. You try to keep as warm as you can , as cheap as you can , And for a lot of people that means burning wood and coal .