The price of a barrel of the North Sea benchmark dropped on Monday by 5.5% to 47.36 dollars, its lowest level since early 2009. US crude oil was also at its lowest level since that time, down by 5% to 45.90 a barrel.
Britain's oil and gas industry has warned it faces its biggest challenge in 50 years due to the low levels of exploration. Industry body Oil and Gas UK said only 15 wells were drilled last year. That was despite strong levels of investment, reaching a record last year and sustained this year.