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Pretty sure that will be rolled insulation. Google 150mm rockwool roll loft insulation and you'll see a bunch of product the standard I normally see specified is the Knauf stuff here which to be honest is pretty cheap. I'd get yourself the basic area where its going to be laid then just work out how many rolls you need and go off their price. Definitely worth getting 3 estimates from 3 different companies just to get a price in mind.
they haven't given a spec apart from 150mm insulation I'll ask what type.
thanks for the reply