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@Bobbo
Is this work being carried out under permitted development, or is he having to apply for planning permission?
Was the property always flats or has it been subdivided at some point?
What is the local authority?
There should already be some form of accoustic insulation specified in any approval he has but how this is enforced and how good his contractors are at pulling a fast one on the building inspector, is another issue. At the very least I'd imagine his guys will put PIR (polyisocyanurate) board (kingspan etc.) between the joists which will give you a marked improvement on noise travelling upwards although impact noise will still travel down.
Your first point of call should be to talk through your concerns with him, see if you can find out if he has factored them into his plans. At the end of the day it will be cheaper for both of you doing it this way.
Also if I were you I would make like a heard of elephants every time you hear someone in his shitter while he's waiting for work to go ahead this will drive home the message about the accoustic insulation.
Going forward there shouldn't be any issues scaffolding onto a flat roof as long as any scaffolders spread the load appropriately. But at the end of the day even if they don't their liability insurance will cover it.