Prime costs are direct labour cost, direct material costs and percentage mark up.
it is not always necessary to quote these costs in our game, and the young QS is probably just being a bit clever and doing it by the book. We usually give just a daywork rate, indicate the minimum of how many hours per man per day we will want, and that includes transport to site, overhead contribution and profit.(not a breakdown of it)
Prime cost only really applies to trades supplying labour and permanent installation materials unless it is an extremely large multi million pound scaffolding package where it is all daywork rates .We always quote separately for all extra scaffolding material needed on site, including transport.
Also don't let them scam you with retention.Retention is for products supplied permanently to or for the building just in case they fail,and retention on your money can be held for a year or more from your account. We are a service industry and all scaffolding is temporary and taken away at the end of the job, there is no defect period as we don't sell it, so it can't fail.
They try it time and again, but they can't argure with us when explained right.
Hope this helps