Thanks for the reply! Blitz didn’t tag it so I only just saw it now.
In answer to your comments:
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none are on dimmers.
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I suspect that there are multiple (but no more than 3) going to a single transformer - at least there is one switch that turns them on or off. Not sure if there is something more complicated happening in the roof space but from what I have since seen, I think the builder would have been keeping costs down so would have done the least he could do
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Yes I know this is the best option but probably can’t be justified on a cost basis (vs using the remaining 50w halogens very rarely)
In the meantime I have been able to replace two of the recalcitrant halogens with 7.5W LEDs. These were in single lights/switch. The 7.5W LEDs did not work when trying to replace halogens in 2 lights/switch