Hi, sorry for the late reply to your question.
I have never worked for them but have been on CPC courses with a couple of their drivers
Their main observations were, every customer wants stuff dropped off early in the am and collected as late as possible in the pm.
The decent customers will leave the goods clean , undamaged , if necessary stacked on pallets and easy access.
The bad customers, will do the very opposite.
Fairly hard graft and mostly mucky building sites with all the hassle that goes with that.
As an aside if you’re currently working for a builders merchant does your crane certification cover you for a hook and the weight?