I was one of the people whose energy provider went belly up and I had the misfortune to get moved to British Gas. I am not a fan of BG and was even less keen to stay when they sent me my approximate energy usage for the next 12 months was likely to cost me £4800 - I only have a semi detached house.
So, as soon as I could I tried to switch. Unfortunately the cheaper tariffs just disappeared before my eyes - thank you Octopus (not) for accepting my switch one day and refusing to honour it the next - so I just had to settle for what I could find. At least Scottish Power rang me back and the chap on the phone was very amusing and we had a pleasant call, which in some way went towards making me feel a bit better with my monthly payments jumping up from £90 per month to £140. Only a bit mind you :-). Hopefully my switch will go smoothly and SP will be able to connect with my Smart Meter.