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It's something like this. Just had a fiddle and now have gone from 2 of 4 working bulbs to 4 of 4 working.
They are (contrary to my earlier assertion) 12v spots. Just disconnecting them and putting them back in with a bit of a jiggle seems to have done the job. If it's lose connections in the little circular bit the bulb pins stick into I can just replace those easily enough. But if vibrations will work them lose anyway then I need another option for lighting my kitchen as it's under my son's bedroom.
Arducius
Mr_Sworld
Could be that the lamp holder bases aren't making proper contact with the lamp pins?