Totally overcharge you, completely ignoring submitted readings.
Almost exactly the same problem as the last review. My gas reading was moving about one digit a week over the summer, i.e. using virtually no gas, but still being charged £30 a month! Also noticed that the "estimated readings" on my bill had no correlation to the readings on my account, both a combination of estimated and submitted, over the period of a year. For an automated system to fail to pick up your meter readings because the gas usage isn't high enough and therefore being charged a completely unrelated bill to your readings is outrageous. No wonder they were coming up cheapest on a comparison website.