Like I said above andy, it's a little too much to risk without being 100% confident on the other aspects of the work, also the debt of the materials on tick and paying out lads weekly then waiting the 30, 60 or 90 days.
Also the paper work and certs you sometimes need like chas, method statements & risk assessment plus contracts ect ect, little bit too much and the risk was too high.
Other companies are well established and in a position to take losses on jobs just to keep in with the client which I would never be able too.
Tbh I'm not the type of guy to come on here and bullshit, being honest here
I usually stuck to small builders/site/estate agents and subbed to small plastering contractors. The impression I got was the bigger you got the higher the risk and you were borrowing to pay the last job while paying out waiting for the next payment, I might be way off, but that's what I thought.