Rafal wrote:

There is some space between the ceiling and the insulation anyway so fitting
a transformer
is not the problem.
Is the lack of space for heat to escape, I think.


As long as there is a bit of air space you are OK.

The heat comes out via the plasteboiard into the room.


Its localises heat buildup that is the problem.



Rafal


Is it difficult to pull a couple of handfuls of insulation out and
shove the transformer in? LV will give you lower running costs both in
electricity and bulb prices.

Regards, NT