British retail energy woes weigh on E.ON, Centrica

FRANKFURT/LONDON (Reuters) - E.ON and Centrica, two of Britain's so-called "big six" energy providers, warned on Monday of a toughening retail market, raising the chance of cost cuts in response to falling profits.Britain's major energy utilities have faced competition from small, more flexible rivals entering the fray while the government has put a cap on electricity prices, causing several companies to cut their earnings outlooks."We will have to talk to the regulator," E.ON finance chief Marc..