Remove the whole thing, and replace with something like this:
https://www.screwfix.com/p/luceco-ftype-essence-flat-fixed-fire-rated-led-downlight-white-5w-515lm/253kl
Wire it directly to whatever junction box you have in the ceiling, removing any transformer that you may have (because of the MR11, which are 12v).
Just replaced 10 of them this afternoon, stuck in the adjustable version of this - really easy to do
If I can do it, anyone can, I reckon.
@Spooky_head started
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Remove the whole thing, and replace with something like this:
https://www.screwfix.com/p/luceco-ftype-essence-flat-fixed-fire-rated-led-downlight-white-5w-515lm/253kl
Wire it directly to whatever junction box you have in the ceiling, removing any transformer that you may have (because of the MR11, which are 12v).