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I'm sure that you can have vellux windows and electricity(even in storage (non living area) spaces.Just because you haven't installed a decent carpet or a bed doesn't make it utility/storage in their eyes
But if you do want to make it living space, height is more of an issue due to needing 150mm of insulation. much of that will fit between the rafters but there is still maybe 75mm that will eat into the room height.
But even if it's classed as storage, (and you just use it for for practising) you'd want insulation and if you've already got insulation on the loft floor, that means the loft space is very cold.
Also (I think) bear in mind any vellux for a fire escape has to be reachable by a Fire dept ladders or cherry picker

I have been very rigorous in my practice and getting bolder in my enthusiasm, and forgot about others.