Timbrook99 wrote:

The
chap from BG today quoted £2370 inc VAT, net of all sorts of discounts
since I have a 3-star contract.

SNIP

I had a complete central heating install 4 years ago. One of the firms
who quoted was BG, a good comprehensive quote but way too expensive. In
the end I went with a large local firm, well under BG's price,not happy
with the local firm, but that is another story. Anyway over the next 6
months and more I kept receiving letters from BG asking if I wanted them
to do the work, each one was a lower price than the previous, until
eventually it was the second cheapest quote I had. so if you can wait,
do so and see what happens. ;-)