The impression I got for the "maximum of 2 providers" was for the commercial training. At this (very early) stage, I'm looking towards Bristol Groundschool and then one provider (possibly full time if I can once I've done the exams) for the CPL, ME/IR and MCC. I don't think PPL and hour building will matter too much.
I'm also going to try and structure my own hour building as much as possible with practicing Navigation and DR techniques and honing them up in preparation for the CPL.