I know a kind chap (Rob, I think) explained this all, but I still don't really understand any of this supplier nonsense.
I am thinking of moving to Octopus though, mostly because it conjures up an image of a cephalopod that can shoot lightning out of its tentacles, like a badboy mini-Cthulu. This might not be the most informed way of choosing a new supplier of gas and electricity. But electric tentacles, that's better than lasers, and you don't want to even think of where it shoots gas out from.
Fed up again with BG, who combine endless expense with exciting new ways to screw things up. Thanks chaps, for returning us to paper billing this time around, who needs either the text or email or phone app when I can a screwed up bill stuffed through the letter box (I assume it went to the wrong address) two weeks later than the bill date.