Fred wrote:
Had a loft insulation survey done this morning, 4-bed house plus side
walls of attic bedroom, three hatches, two tanks. It came to using
roughly 55m of 200mm insulation material to top up existing
insulation. The quote is for 255 pounds and that includes a 40% from
my energy supplier.

Does that sound reasonable or should I seek out further quotations
from suppliers not subcontracted by my energy supplier (Scott Power
btw).

What's the existing insulation?
How long do you plan to stay in the property?
What's your annual heating bill?
How much of the house heat is lost through the roof.

It may not be economically worth insulating.
Especially if yours is an older structure, where though the roof has far
less than currently recommended levels, there isn't much point, as most
of the heat goes out the walls.