While Sir Keir has argued that new drilling in the North Sea would not reduce domestic oil prices because they are set internationally, some ministers and industry figures are now thought to be challenging this claim

A growing split is reported to be opening up within the Government over Energy Secretary Ed Miliband's opposition to North Sea oil and gas.

While Sir Keir has argued that new drilling in the North Sea would not reduce domestic oil prices because they are set internationally, some ministers and industry figures are now…