I had been a UW customer for a number of years, but this year after I moved house they really dropped the ball. Ignoring my initial readings, they went with the unbelievably high readings that the previous supplier gave them - resulting in an electricity bill for £195 for June - the height of summer when barely anything was switched on!! I switch to Octopus, and they straight away noticed that something was way off, and enter a dispute with UW - who are now refusing to accept Octopus' proposed opening readings, as they are lower than the ones UW started my account with (as they would be)! Never again.