By Susanna Twidale LONDON (Reuters) -CEOs from four of Britain’s leading energy suppliers called for more government action to cushion the impact of prices that are expected to surge in October ahead of peak winter demand. Power and gas prices for millions of households rose 54% from April after regulator Ofgem increased its cap on the most widely used tariffs following record wholesale global gas prices. Since the new cap was set, global gas prices have risen further, following Russia’s invasion of Ukraine. Analysts at Cornwall Insight predict the next cap level, which comes into effect in Oc…