I'll also add that British Gas are perhaps the single worst company you could ever deal with if you have an issue. It took them 8 months of our fixed term 12 month contract to fix an issue I had to tell them about where I wasn't paying for any gas.

First they blamed a system switch. Then the deal I was already on wasn't available. Then I had to wait for their finance team to manually rebuild the deal. Then something was wrong with the meter setup that required an engineer. Then that engineer didn't fix the problem so a second engineer was needed. Then they accidentally cancelled my "change of tariff" because the adviser didn't recognise the new custom tariff. We finally paid exactly 1 month of gas before before it stopped charging us again. After which I bailed, was told not to bother paying that missing month as an apology (I genuinely don't think they knew how to charge me money at this point) and they would waive my cancellation fee.

Octopus meanwhile have so far been flawless, and cheaper.