Never once in my life felt the need to do one of these. As context there are 2 people living in my house and we use no gas at all and very little electricity (same room same tv short time periods). We were paying £130 a month for dual fuel tariff and after reviewing other deals seemed very expensive for what we were using. Turned out British Gas constantly messed around with my payment and stopped it for some months and hiked it up twice as high others, then upon leaving switched me to an ‘emergency plan’ which I assume was to just milk any extra money from me costing me £200 in one month. Received an email stating that a debt collection agency will come to collect if I do not pay, cannot speak to anyone other than outsourced individuals with no power to do anything other than get you off the phone. Total joke, don’t join them.