On Wednesday, 25 September 2019 20:33:05 UTC+1, Chris Green wrote:
Given that the boiler is about £500, does a total of £2000 for
installing it in place of an existing boiler seem reasonable?

I'd expect it to be a /bit/ less than that if it's a straight swap and the condensate drain, controls, etc are all already in place, and external ladder work isn't needed.

But then London prices ...

Owain