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This is sooo not a thing
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!
This is sooo not a thing. It reminds me of the landlord I had in York once who told me the bulbs in a light fitting were blowing because they were upside down 😂 He wasn't an evil landlord, he was a lovely chap, he was just a bit dim. Bless him.
I think @TW might be right and it could be heat related. I have never had good experiences with halogen or 12v spots so I would be replacing with LEDs and 240v where possible (I don't like transformers either).
Screwfix. E.g.
https://www.screwfix.com/p/lap-gu5-3-mr16-led-light-bulb-345lm-4-5w-5-pack/6917p
If you're happy to spend more and want better, Philips.
https://www.energybulbs.co.uk/products/Shop+By+Brand/Philips+Light+Bulb+Store/Philips+LED+MR16+Range/Philips+LED+Non-Dimmable+MR16+Range/Philips+CorePro+LEDSpot+5W%3D35W+MR16+(GU5.3)+-+Cool+White+-+36D/756420613?gclid=Cj0KCQjwsZ3kBRCnARIsAIuAV_SJxcWIIs71oh_Psis-tJzR2jMQ9jE0w6nW8RaFAgrArwDyX2IL5cMaAhzeEALw_wcB
I hadn't bought LAP bulbs before (LAP is their own brand I think) but I've just fitted a five pack of their G9 LEDs and I'm happy. Three year warranty too.