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kkg337-
literally considering the same in my kitchen. hoping to just terminate pre transformer and junction to this so would appreciate you letting me know how it goes!
I took out the transformers and wired a lampholder (without the support) straight into the junction box. Seems to be running fine so far with LED GU10 bulbs
ffm
Not sure, my understanding is that like-for-like replacements aren't notifiable.
Notifiable works:
The installation of a new circuit
The replacement of a consumer unit
Any addition or alteration to an existing circuit in a special location
Since I reckon I need to replace the transformers anyway I could switch to low-voltage LEDs (the new transformers would need to be able to provide 4 or 5W, which halogen transformers can't), but it would be easier and cheaper to buy mains-voltage LED fittings with an integrated bulb.
It's very common as far as I know, although you can have a single larger transformer to power several fittings. The advantages of one transformer per bulb are (from what I've read):
More of the cabling can be smaller diameter since the the high-current side from the transformer to the bulb is shorter
The transformers are nice and small so you can fish them down through the downlight holes to replace them.
There's a junction box at every downlight that you can wire a different fitting into (which is what I'm planning to do, just need to work out if I can switch to mains-voltage fittings).