Heat pump grants worth £5,000 to replace gas boilers not enough, say critics

A new scheme has been announced which will start April 2022 - but it only covers heat pumps...

"the new Boiler Upgrade Scheme will run alongside other funding packages such as the Social Housing Decarbonisation Fund and Home Upgrade Grant that are helping low-income and vulnerable households with the cost of installing low-carbon measures and improving energy efficiency"

I haven't been able to find any information on the "Home Upgrade Grant"...it also makes reference to the scrapped Green Homes Grant;

"we are investing £1.3 billion this year alone to support people to install energy efficiency measures and low carbon heating by allocating support across several existing government schemes, including the Green Homes Grant Local Authority Delivery Scheme, the Home Upgrade Grant and the Social Housing Decarbonisation Fund"