iGaming Business – UK bookmaker William Hill has posted a 31% year-on-year fall in quarterly group operating profit despite a huge increase in mobile gaming net revenue. Operating profit slumped by £24 million in the period, about £20 million below expectations, with William Hill citing disappointing retail figures in July and unfavourable sportsbetting results as being major contributory factors. However, mobile gaming net revenue increased by 126% in the three months until September 25, with mobile now accounting for 18% of gaming net revenue. Total revenue for the quarter was 10% up on the corresponding period of 2012. William Hill…