Free insulation is offered to residents in Britain through Government funding, by means of The Energy Company Obligation (ECO). This is a government scheme to obligate larger suppliers to deliver energy efficiency measures to domestic premises in Britain.
Cavity Wall Insulation Grants About 35% of all heat loss from UK homes takes place through external walls. In general, houses built from the 1990s onwards have wall insulation to keep the heat in, but if your house is older than that it may not have any wall insulation. If this is the case then you may be heating the outside air, instead of just heating your home.