A director at energy regulator Ofgem has resigned, accusing it of favouring businesses over consumers with a rule change that will add as much as £400 to the average UK household energy bill. Christine Farnish, a non-executive member of the Gas and Electricity Markets Authority (Gema), Ofgem’s board, tendered her resignation to the business secretary, Kwasi Kwarteng, in early August. Farnish said...