I recently had my Disco gas converted. On getting it back it's loosing about 1lite of coolant every 200 miles. prior to the conversion it didn't use any water at all. my question is does the inlet manifold have any coolant galleries etc or is there anything else that could have been disturbed by the conversion. I hope it's not the dreaded liner problem.

in my case the gas converter has two water hoses to it, normally taken from the heater hoses. This stops it freezing up, check these out for leaks/loose connections

Also check the connection at the throttle body housing as this is prone to leaking (check for coloured stains on the top of the cylinder head in the area of the throttle body). This is not really needed, and is best to disconnect the hoses and connect them together with one of them hose connector thingies from Halfrauds.