The solar and battery system can work very well.
There is a scheme where you operate your kitchen appliances during a 5 hour period at night.
Some people have been charging large batteries on this off peak electricity then sending the stored energy back into the grid and making money from it.
I am too old to install solar systems or any other type as it takes about 25 years for payback. I do have one solar panel charging car batteries in the garage for some outside lighting.
I had my house insulated free about 20 years ago including the cavity. My roof insulation was already done at about 300mm thick. Saves a bit of money.
I can get a free combination boiler but having been repairing them when i worked, they would cost more than keeping my 35 year old boiler system which has cost me about 40 pounds for spare parts in 35 years. Still storing hot water in a sprayed insulated cylinder but connected to a 2 bar pump for a decent shower. I took out the bath.
Those small social housing bungalows are a great place to live. There are about 100 here in Exmouth.