i have never understood builders getting in new people, they usually keep to there own little group, (due to back handers) unless they ripped someone off, i got stung on a plumbing job like that once, phone call out of the blue, big job, loads of other jobs to price up, even a job in his dads house, quoted and got thought great, started the tiler in this dads house and went in to cap everything off on a other job so they could begin, then got booted off all the jobs as tiler had used 2 mill spacers instead of 3 mill (i know)
basically got shafted, as bloke only wanted quotes so he could show customers and pocket the money, then put his own lads on it lesson learned