"Tradesmen"

I've certainly had to pull people up on that one. ;-)

Chris

IME, they won't even have basic pipe couplers, elbows, etc.

I was redoing the bathroom in a previous house of a relative, and we needed to get it done quicker than I could just spending weekends on it, so got a plumber in to do some of the plumbing. I left my stock of end-feed fittings all laid out for him so he didn't need to keep popping to screwfix to buy an elbow, flexible tap connector, etc. (and it meant they cost us BES prices, and not screwfix prices). Mostly, it worked, although when he ran out of one of them (due to using vastly more than I would have), he made a couple of trips to buy push-fit equivalents from screwfix.