Forgetting for a moment whether downlighters a fundamentally a good idea or not (for various reasons these are staying, end of!) my question is whether to go for 12V or 240V ones?
My current halogens are 12V, but AFAICS I'll still still need to replace the PSUs for some LED-compatible ones. On the plus side, I can re-use the existing downlighters; they are quite a bit larger than modern ones (12V or 240V) so replacing them would be something of a ball-ache in that I'd have to *reduce* the size of the holes in the ceiling.
So, is there any compelling reason to swap to 240V?