I looked at the scheme but was not tempted in the slightest to change energy suppliers. I am with Co-operative Energy and believe they are the cheapest of all the energy suppliers. There is a comparison page on the top right hand corner of their main webpage. I haven't heard of a cheaper supplier.
The Co-op is a pretty ethical company and you can also earn Co-op dividend points by choosing them as your supplier.
Here's their webpage:-
www.cooperativeenergy.coop/
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Does anybody work out with kettlebells ?