I have tried to find soMe locally but a good search isn’t too great as many company’s are using landing psges but are from far away so won’t know local council funding.
I’ve got an end terrace house(mid 70s) which is all solid walls internally. Great in the summer but not so great in this cold weather!
I’ve had a company come out regarding cavity wall insulation and apparently I’m just under 40mm clearance from the polystyrene sheet(old style insulation board)...