BGas quoted me 7.5k – local dude did it all in for 2k.
Sounds par for the course. We had a full CH system installed at our last place, everything apart from a hot and cold tank. We had 3 quotes from reputable local tradesmen between £3600 and £4400. All would have been good firms to employ. They all came round, chap in work clothes, measured the house, listened to what we wanted, and sent a written quote a few days later. Great.
Someone kept banging on that we really should go to BG, so we got them in for a quote. Young bloke in a shiny suit turns up, has literally a 5 min look round (If that) and said "£6000, how does that sound?"
So I showed him the other quotes. He was soooooo embarrased and left rather quickly
BG just employ a local fitter anyway, just cut out the middleman!