Terrain Vehicles, Bexhill Road, St Leonards on Sea, indy Land Rover specialist are very good.
Telephone No would help: 01424 200262, worth checking to see if they are ok with LPG.

I have driven past them a couple of times, will check them out if re setting the trims on the LPG doesn't help!
 
Sounds like a faulty solenoid to me.

I had the same problem on my jeep with singlepoint. Would run up to 30 mph then cut out. turned out a solenoid had failed.
 

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