Well, it doesn't run properly on LPG any more, and I don't understand why. Seems happy enough on petrol though, not that its moved...
Confused from Confusedville...
So you've managed to break it again

What's it doing and what have you had off? :-?
Only LPG bits I've touched are removed the injectors whilst taking plenum and inlet manifold out. Put it back as I found it, running small tubes the same way it was. I did initially forget to plug in 3 injectors, but didn't start car at this point, as LPG ECU bleeped due to this.
Not put lappy on it yet, come in for some food, as I forgot to eat today 
So what's it doing? Lumpy, switching back, stalling, what? Why take the inlet out?
I'll ignore any cold symptoms, as that probably still needs tweaking. When hot, it idles well on petrol, switch to LPG, and within about 10s it starts to hunt (so badly, occasionally it temporarily drops back to petrol).
Hold it at 1500 rpm on the throttle, switch to gas, and immediately you can feel what seems like a misfire.