I have an L322 TD6 with an aux heater and it works fine, but I would love to have the option of a remote start for it. I have purchased a fob for it but it seems that there is more to it as you need the controller and the wiring, having ascertained that I do not have the controller nor it appears the wiring! does anyone know what sort of a job it is to install both, a new controller is £200 ish, don't know how much the wiring costs.

Save your money and send the missus out to start it ten minutes before you go out.

I would start by some light bed time reading here