While “surfing the net” for something or other (no not that!), I stumbled across Your Energy Sussex.
“Your Energy Sussex is operated by West Sussex County Council with support from councils across Sussex including East Sussex County Council and a range of local district and borough councils. Our profits are used to help local people who are struggling to pay their energy bills. Our gas and electric prices are cheap. You get a fixed deal on our best rate for one year, then we will call you to offer you our best rate every year. National companies don’t do this. We don’t make money for shareholders or directors’ bonuses. We keep costs down by only selling gas and renewable electricity to people who live in or around Sussex.”
What’s not to like about that? There is not a lot of mains gas in Brightling of course, but definitely worth looking into for electricity.