Hi Supermanalex,
Well that's made my mind up. There is no way I could cope with that. I panicked when I had a puncture!!! Much as I love the power, I think I'm going to have to give in to a girly mini or beetle or something. I hope you get to the bottom of your problems soon and get it sorted out - it doesn't seem right that the garage has got away with such a dodgy conversion.