Despite the announced profits increase, British Gas owner Centrica would not rule out further rise in tariffs this winter, blaming "upward pressure on costs".
We will keep prices as low as we can for as long as we can. If prices do have to go up, we will delay it for as long as possible.
Mr Luff said the Government-backed ECO (Energy Companies Obligation) scheme, which helps customers with boiler repair or replacement or insulation costs, would "inevitably impact on customer bills ultimately".
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Many central and eastern areas will start cloudy with some rain and hill fog.