see how that plays out in the coming months. ~., , see how that plays out in the coming months. , ., steeply rising gas prices could last for up to two years, according to the boss of the uk's biggest energy supplier. chris o'shea, the chief executive of centrica — which owns british gas — has told the bbc that the high demand for gas was partly driven by many countries moving away from coal and oil. our business correspondent ramzan karmali has more. it is a stark warning today from the boss of the country's biggest energy supplier. higher bills could be with us for some time to come. i can simply look at what the market says at the moment and the market suggests that high gas prices will be here for the next 18 months to two years. the reason behind higher bills is down to what is happening in the wholesale market. across the world, as pandemic restrictions eased, the demand for gas soared. late last year, prices were nine times greater than normal and still remain a lot higher than usual. but the boss of british gas believes