Oh dear I was looking for some of the different companies offering an extra £400 on top of the government's own £400, and it seems that some of the energy companies'
own engineers are giving estimates on the values of boilers, that vary wildly different to the ones that independent engineers give, often meaning people aren't getting
quite the deal they thought they were, when they first agreed. It's not my job to name & shame here, but follow the links and you'll find what I'm talking about.