doublecuffs:

!!!THANKS!!!
I am an existing Powergen customer so I just called and they confirmed that this EnergyOnline Extra Saver tariff is even cheaper than the EnergyOnline Winter Saver tariff that I was on. They were quite happy to switch me to the new cheaper tariff. I was getting 11% discount and this gives something like 24%. Apparently this is in response to British Gas announcing their cheaper tariff.
You can check with the online comparison websites but they take a while to catch up with the current offers, by which time new offers are available that they don't list. Just bite the bullet and switch is my advice.
Glad to be of assistance! - problem with posting these kind of deals is that, via responses, they go off tangent with opinions on changing suppliers, whether you should change suppliers, etc, most them are helpful of course!, though perhaps by not caveating my initial post sufficiently, this kind of dilutes what i was principally trying to do in alerting happy online Powergen customers to a new rate which they may not be getting and which they could save money on.
I did try to pre-empt that by linking it to the previous thread on the Powergen winter tariff (which this rate is cheaper) and by advising if you are happy with Powergen and if you are using the online tariff, then this should be cheaper. No point waiting till April paying higher prices on Powergen if you are happy with Powergen, as a supplier, now.
Powergen may not be best for you, it may or may not be the best time to switch and other providers may offer a better deal for your consumption patterns!
