During the summer recess, when I was touring villages, I found in my corner of Devon that some constituents are worried about whether they should replace their oil-fired boiler in the next couple of years with a heat pump or put their faith in hydro-treated vegetable oil. Some have been encouraged by the pilots of so-called HVO as an alternative source to heating oil. What assurances can the Minister offer that it will be a truly sustainable source of fuel and not made from palm oil, which encourages deforestation? Or should we put 100% of our efforts into heat pumps?