Happy birthday, Mr Speaker. My Lib Dem predecessor, the much-missed Andrew Stunell, pushed for the zero carbon homes programme during his time in the 2010 to 2015 Government, having brought in his first Bill on that subject back in 2004. Sadly, those standards were scrapped as soon as the Conservatives were governing on their own. The Energy and Climate Intelligence Unit has estimated that, had those standards been reached in 2016, households would have paid £5 billion less in energy bills as a result of living in better insulated and more energy-efficient homes. The Secretary of State earlier mentioned the future homes standard, which is bringing in welcome steps on solar panels and so on. When will the Government go further to reach zero carbon homes standards with a fabric-first approach?

What is the Secretary of State doing to make it more affordable for households to make their homes energy-efficient? The current model is that those who can afford to outlay some funding then get a taxpayer-funded subsidy, but those who cannot put down those first few thousand do not get that support.

Warm wishes for your birthday, Mr Speaker—and I am going to talk about warmth, as you might expect. Over the last decade, we have seen so many households living in Dickensian conditions, with dark, damp and cold homes, and having to choose between heating and eating. With the warm homes plan widely recognised as the most cost-effective way of making homes warmer, healthier and cheaper to heat, can the Secretary of State confirm exactly how many homes will be covered? Is the current scale of the plan truly sufficient to meet the challenge we face?