materials get sold back to the house builders
depending on the amount you buy depends on what you pay.
I dont think it would effect the labour rates as they vary so much throughout the trade.
some fims make that much on materials I dont think they care about the plastering
if bg were to put site deadlines back I wonder who would pick up the bill.
I've been on sites in city centres where there being billed 5k a week for going over the finishing date.
If a house builder has a family moving into a plot on a certain date and bg cant supply the materials on time ...... I'm sure the house builder wont loose a court case.
seen it happen so many times when bg cant supply enough boards house builders will jump on anything.