Read about it here. Just in case some don't know about this I thought it might be useful to post.
38 Degrees and WHICH are working together to try and get a better deal for gas and electricity consumers - the more people sign up the better chance they have of getting better terms. The reverse auction will be held Wednesday so there's still time to sign up. There's no obligation, you don't have to accept the deal they're able to negotiate but imo any opportunity to get a fairer deal on power is worth looking at.