Always best to go dual fuel, on DD and go on an online tarriff- or in this climate a fixed rate one. I think saving money is coming second place to controlling the monthly spend at the moment, given all the stories about the price increases!

In most areas BG's Click 5 comes up as the best, but if I was you I'd look at the fixed rates before the cheaper internet options as the internet tarriffs will also increase by the same percentage as the regular tarriffs. There is a separate search option for that I believe.