Must be made of gold if that scaffold would cost a few grand.madness
Scaffolding would cost at least 3K. The scaffold co. would have to apply for a licence to erect the scaffold. if the block is on a road junction it may need 2 or 3 licences. 1 licence for each road. each licence is £100 for a month, extra if the work runs over a month.
I would carry out crack repairs to block, parinter renovation base coat, full mesh, parex top coat, two coats of primer then an acrylic finish coat. this method would keep the weight down to a min.
any work in London is slow and expensive, I would run the material in daily as storage looks a problem.