uSwitch 2018 customer ratings are based on an independent YouGov survey that was conducted between 7 November and 1 December 2017. A total of 17,313 UK energy customers were asked to rate their energy supplier on overall satisfaction, transfer process, value for money, customer service and how likely they were to recommend. We equally weighted those five scores across suppliers with at least 50 responses to create an average supplier rating for each.
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