Yep, unless people have massive 3 storey, 6-9 bedroom houses with around 37 radiators, and 90 electric points, I have no idea how and why they are getting joint energy bills of £500 to £700 a month.
They were either given an artificially low amount to entice them into a new energy provider several years ago, and it bit them on the arse when the energy provider closed down, and the new one (British Gas for many) adjusted their payments to what they SHOULD have been, and added a bunch of £££ on to claw back the debt.
OR they have their heating on 30 degrees C six months a year.
The 'I am freeeeezing, AIBU to put the heating on' threads when it's 19 C outside, and drops to 12 C at night, (in JUNE,) shows that some people seem incapable of having a house at less than 24 C inside. Most people will cope with a jumper or a fleece over them, and won't put the heating on til it drops below 10 C in the day, and 2 C or 3 C at night. Some will wait longer. But some people crank up the heating at the drop of a hat, and then come on here crying because their gas bill is £450 a month!