If The supplier you ended up with on 11 August 2024 isn't from the scheme, you received’t get the discount. This is true regardless of whether your new provider is in the scheme. The GBIS is actually a government-backed scheme created to assist the minimum energy-effective houses across Good Britain. https://freeecogrants.co.uk/how-to-insulate-the-roof-of-your-uk-home-with-100-grants/