Yesterday it passed its Taxi MOT......got it plated for work and had a radio fitted.
So today (as vx had my meega) i gave it a good workout
Its got a couple of issues 
It keeps switching to petrol when plodding about town.....
I went Brizzle airport this afternon....and giving it stick down the m4/m32....it was fine, ran on lpg all the time.....just doesnt like low revs it seems
Other prob is, this morning it decided to turn the headlights on.....they've been on all day, wont turn off unless you turn the engine off, then come back on again as soon as you start. 
Dunno if Martin has any ideas about the lpg prob? Pressure prob maybe? :-/
Lets have a think
They switch to petrol at low pressure, low temperature, or can't open injectors enough
Check one - do you have an LPG filter if so please clean
Check two - can you check vacuum pipes to evaporator
Personaly I would expect the other way round!
Thanks for the reply Martin.....yes i would have expected the other way round too....
i drove it up a steep hill earlier 50mph in 2nd .....not even a miss.....pulled up at the top....let it idle for a min or two and it switched to petrol :-?
Dont know about LPG filter....but maybe yes..coz it says this in LPG guide for the car....
every 60k miles...
check and adjust gas pressures
replace regulator shut off filter
replace splitter filter
I will have a look at the evaporator vacuum pipe...
As for the system it has fitted it looks a lot like a Romano type like my Omega...
Evaporator looks very similar....tho i guess they all look much the same
I can see the lpg feed rail.....its a metal tube with pipes off it to the injectors (on my omega the rail is plastic....tho guess it does the same)
Other thing is on the service history at 60k mile service it had all the lpg injectors changed.....doesnt say why?
Cheers