You can change your DD online. They wanted to put mine up to over £440 a month but I changed it to £300I did an online meter reading and bizarrely the dd I had been paying before would still cover my usage after the rises.
So they bumped up the dd for no reason.
Then read a bbc report about the very same thing.
So I've changed the dd back to last year's levels.
Check people. You might be paying extra for fuck all.