Opec

Increase from 2.1% puts pressure on the Bank of England

Brent Crude hit $64.3 a barrel

Turkey threatens Kurdish exports

Adapting or die

Architas advent calendar - 4 December

Brent trading above $50 a barrel

Follows tense semi-annual meeting

The price of Brent crude oil has fallen another 8% to $71 per barrel after the Organization of the Petroleum Exporting Countries (OPEC) decided not to cut output on Thursday.

Oil prices are set to remain volatile in the coming months as a result of tightening of the crude markets, according to fund managers at BlackRock Merrill Lynch.