
Steve, my bulb is in bits, thats how I know.
Lupine have told a german speaking friend of mine that when you buy the spare bulb off their web site it comes complete with all the removal and fitting destructions, spare bulb is £63 plus postage, so not a life changing saving.
As for your problem, try to find someone you know who also has an E5 and try swapping bits to try and isolate the problem and if none of your mates have E5s go back to the dealer and try swapping bits, my money is on the battery but thats a guess