Boiler upgrade scheme, which provides grants of up to £9,000 for sustainable alternatives, expected to be slashed in budget

When Bill Tuck first started installing air source heat pumps six years ago, other heating engineers were skeptical about whether the green technology would take off. “Now, the conversation is completely different,” he said.

“I’m getting approached by them saying: ‘Mrs Jones, my customer for 15 years, she’s enquiring about a heat pump. What can you tell me?’ The whole narrative has changed.”