British Gas has been criticised for announcing record profits just after it raised prices. The UK's biggest gas supplier has just revealed a 24% increase in profits over the last few months. About eight million customers were hit with a price hike on December 10, raising the average dual fuel bill by £80. Regulator Ofgem found average industry profit margins on a standard dual fuel tariff rose to £90 in November, from £65 in September, and is currently investigating the 'big six' energy providers.