Through the add on ebay posted by sacha K
I got in touch with a guy who is selling his vx with lpg.
The system is Romano with a 60 litres underfloor tank.
Did some searching and found a site:
http://www.go-lpg.co.uk/

They have coverted a Mitsubishi Shogun 3.5 V6.

Is this the same engine as our VX?