To everyone concerned in obtaining a lovely new boiler on my behalf: I would like to say a BIG thank you. Everyone was so kind and helpful and it was installed with the minimum of trouble to myself. I will be warm and wooly-free in the months ahead. Again, thank you all.
If your home was built before 1919, its external walls are probably solid rather than Cavity Walls. Find out more about how solid walls can be insulated either from the inside or the outside.