Forgot to mention in my post about charity grants earlier:
When I was looking at assistance for my utility bills I stumbled on "warm home discount" I had seen this before and was sure that it was just for pensioners and low income households with small children.
I'm with First Utility and I looked on their website only to find that they had extended their scheme to include disabled people in receipt of PIP along with other groups you might fit into as part of their "extended scheme" I'm not sure if any other providers do this but it's worth a look.
I've not seen this widely advertised - like most things - seems it's only there if you know.
All I had to do was fill in a form (they didn't even ask to see loads of evidence) and they emailed me a few days later to confirm that a credit of £140 would be applied to my bill in March. Not bad for 5 minutes work!