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Disagreements between Russia and Ukraine could have international implications affecting gas prices.

The regulator indicated that it had not seen enough improvement in the energy supplier's doorstep sales techniques.

Harriet Harman suggested that new legislation could be put forward at Prime Minister's Questions yesterday.

The reduction could result in higher energy bills for consumers, if wholesale prices rise sharply as a result.

Gas and electricity firms could even face a Competition Commission investigation if the reductions are not made, the regulator has indicated.

The government has put pressure on energy companies to make sure consumers benefit from lowering wholesale prices.

Campaigners called for a change in the law today, in order to help homeowners switch to low-carbon heating alternatives to gas and electricity.

A report on industry competitiveness from Ofgem has led to the price changes, which will see costs cut for customers by £14 a year.