She knows that I know him. See him in the merchants all the time but don't know him well enough to start asking questions like that. I'm not a loud, tea-swilling showman like most of the guys in the merchants and this guy is very much like that. Generally I buy my stuff and get out.
There's another firm in my town with 3-4 vans and I know they did a combi swap for my wifes friend (+condensate, a tricky one too) for £300, inc materials. They installed an Ideal Pro Combi with a 9-year guarantee. Her total cost was £900 or something. I didn't even quote her, just told her to go for it.