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Mr_Sworld-
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
Well that is good to know! I can't see the transformers for the 12v lights when I remove the bulb holder (these are under the cupboards and shine down onto the worktop) there's just a plastic connector block that clips together so you can remove them easily. I guess the transformers are hidden behind the cupboards.
The main lights in the ceiling are 240v, so no worries about transformers there. What is odd is that I replaced a bulb on Sunday. Monday morning it was gone. Monday evening it was working again but a little flickery. There's definately something wrong with either the brand new bulb or the wiring. Will swap two bulbs over this evening to see if it's bulb-specific!