I deciced to switch to British Gas Click Energy 6 electricity on 9 October, & got an email confirming the tariff I would be swiching to, but today I received a "Welcome" letter showing a different tariff - 28% higher than the one I signed up for. I phoned them (0845 - "we'll have a bit more of your money thanks", naturally) & they've changed it to the correct tariff (& also started trying to sell me other products!).
So it's just a heads up to anybody switching - this was an automated online order, but they still put me on a higher tariff - so please, if you do switch to any company, & especially if you're switching to British Gas Click Energy 6, make sure that you're getting the rates you signed up for. And despite these hassles I'll keep switching to cheaper deals as they come up because the energy companies deserve no loyalty, and we need some genuine competition between them.