Alright mate have exact same problem, and its got me scratching my head but someone told me there is a rely switch but only a garage can check it...but dont quote me on that as mines still sitting outside minus brake lights.
Yep... had two brake light switches replaced so far... although I know for a fact when I first dismantled mine to test with my meter it worked when I put it back in the circuit. So I'm inclined to think that it's some other issue with the electrics. Shouldn't have to get a new switch every MOT!
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