The battery died, due to the excessive amount of times the car needed to be restarted on a journey. By this time, i had completely stopped using LPG for over two weeks, switching over occasionally only to see if the problem was still present.
I bought a new battery, and it turned out that although the previous battery had held out perfectly acceptably for the past year of ownership (and through a winter period), it was the incorrect battery for the car, being 43ah instead of 60ah. So a bit of split culpability there, whilst i am confident the battery would still have worked without the additional strain of the LPG kit's failings, it could always be argued that the battery wasnt up to the job.
Anyway, I bought a new battery and went to fit it. Joy of joys, where the gas exchange unit had been bolted to the battery tray, it precluded access to the battery clamp. In fact it was screwed to the battery clamp itself, with a smaller than two inch gap to get access to the securing bolts (pictures to follow).
Had I known the lpg kit would have prevented the easy maintenance of user serviceable parts (such as the battery) I never would have had it fitted, and was never informed of this at any time during the installation.
After much swearing, the gas exchange unit was unbolted and the old battery was removed. When I went to fit the new (correctly sized battery), I was prevented from doing so AGAIN!
Turns out the mechanics at warrington autogas had seen the large space in the battery tray (which should have been filled by a correctly sized battery) and instead of thinking "that battery looks a bit small, maybe we should tell him to check it" they thought "thats a perfect place to fit our lpg ecu box!!!", thus preventing me fitting a new battery. I had to pull this out, and rest it in an unideal place to the right of the battery.
I phoned Andy at WA again, obviously unimpressed, and again, I received a load of "well that's strange, it shouldnt be doing that" and "you should be able to get to the battery". To his credit, he did advise me to get it straight in to him and he would try and sort it out so I will report back once I have!