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I would only be interested in basic fault diagnosis really, so I could be sure there was an issue and then get an electrician out to investigate and resolve. The plug-in tester unit you showed looks quality, but probably too much expenditure for the occasional DIY user like myself. Putting the...

Because I'm replacing 12V Halogens with 12V LED bulbs, that I've already bought. Like for like swap was my original plan.

Ok, any more details as to why you state this? Thanks.

I already checked for the double square and it's not on the LED driver; neither is the shield version. There is nothing on the underneath, so all the markings are visible in the picture I posted.

Thanks for the responses. The LED driver is not double-insulated (there is no class II symbol or marking I can see) and it does feel like a metal, not plastic case - this is a picture of it: Below is a picture of the junction box I have with the unsheathed earth connection visible (the...

I'm replacing the 20W GU5 halogens in our kitchen with LED bulbs. I have suitable bulbs and also got LED drivers to replace the transformers, as I noted some of the existing ones had minimum load ratings and wouldn't be suitable. I checked the existing setup and the mains twin & earth cable...