Oddly I got hold of a 20mA fuse that works but I'm expecting it to pop any minute. Have ordered some 40mA off eBay. Hopefully that should sort it. Next up will be the bulb. Don't know what to do there either as it's a real odd one that's soldered to a mini board. The plan was to replace it with a lamp holder and a suitably rated bulb but whenever I try to measure the voltage across the blown lamp with a voltmeter, this blows the fuse. There's no rating on the lamp either and it's a real odd looking, almost a hand blown sweet shaped bulb. Still I've ordered 10 fuses so hopefully that's enough to get a reading for the bulb.