Thanks for all the replies .. useful info

To put the record straight, the guy wasn't talking about him doing the work, when I asked if the LPG install prevented any such work, or made it harder, we started to chat about the jobs I did on the old beast. It was then he advised ME to do those jobs before an LPG install, so he wasn't trying to make a fast buck ... he even advised me regarding Bosch leads, Bosch CPP, and NGK spark plugs. I was just wondering if you experts agreed.
I was concerned about the 50K comment as so many folks here have LPG.. seems he may be being "protective".
This guy is offering a 100ltr tank, BRC system, 2 year warranty, courtesy car, free 1000 mile check for £1850+VAT, and comes with high recomendation from 2 sources known to me, one a Disco, one a Rangy ... he says he's done one 3.2 and "several" 2.5's. for the BRC system he is £400 cheaper than the nearest.
Opinions anyone ??