basically its one of those things you wonder how you did without
dead handy
e.g now its icy outside but my screens are clear so I can just drive off home...no faffing
my colleague in the next office is going to spend 5-10 mins clearing his windows on his X5 and waiting for it to warm up

Ok think I'm sufficiently clued up about what it is now. Just one more question... kind of got my heart set on a V8 Supercharged RRS (ie petrol) model for the acceleration, noise etc... do these have the heater too?

Petrols do not have a fuel burning heater. They're fitted to diesels because diesels do not run hot like petrols do. Having a timed or remote heat option is a side benefit to its primary purpose. L405 P400e Autobiography (MY2020)... Silicon Silver / Espresso
RRS TDV6 HSE Lux (MY2011)... Nara Bronze / Arabica - now gone!

Gotcha - thanks for all the explanations!

I hope you enjoy the V8 Petrol. But the money that it will cost you Tax, Insurance, and fuel running costs About 12 MPG. You might get close to a 10MY 3.0 ltr TDV6 itisme

That would probably be the sensible thing to do... maybe in a few years when I've grown up a bit more. For the time being I wouldn't want to drive anything other than a V8 Besides, it's not been this cheap to fill them up for years!