Paul,
The low-down on Downlights in this part of the world, is that they are recessed into various types of ceilings over here.
The worst type being the Skillion roof,where you only have, say 200mm, to fit a 150mm fitting into.
Being a fire-fighter, these are not good news, as they are renowned for setting roof-spaces on fire.
The powers that be over here, thought to regulate, the types and sizes of lights, fiited into ceilings.
It is not so much as the fitting of the equipment into the ceiling space, it's when Builders put insulation over the top of them, effectively cutting off their ventilation,hence the temperature rise.
What has actaully compounded this problem,is the advent of Insul-Fluff, this is a mix of wool and macerated paper, spray,this over the top of a few downlights, the result does not take a rocket-scientist, to work out.
But, as Old Appy will back me up on,the Building Industry, over here is so sour
about us having self-certification,that they lump the extra burden of making sure that the safety of our installed light fittings,are not compromised by some Builder, lazily installing insulation over our downlights. :rolleyes