Haven't moved away as there is that ghost second (third?!) account that would still be hanging over my head, as is happening to a neighbour in the building right now (First Utility was already set up as the provider in this new build). I'm also finding that they have the very worst reviews of all gas/electricity providers..
I put a small personal recommendation on Twitter ('never ever consider using these people as gas/leccy providers') and they came back to me asking whether they could help. Can they?
Sorry about the lengthy post!