Mine has gone tits up and I require another. If anyone has one they wish to sell, that'd be great. Ta. It just clicks and nothing (Battery fine, checked), plus one of the pins you bolt the high voltage to, slides in and out by 5mm, which can't be right. Its very loose. Plus its well rusty on that connector.
I found one from Louigi Moto at a more reasonable £20 via fleabay. Some people asking for £40 for used. Thank god for Rich being sensible and not fleecing customers. Thanks for the offer Paul. I believe they are the same. But I found and paid before I saw your post. Nuts.