s down nearly 75 per cent since trading above $115 in mid-2014. Six months ago it dropped to $56.8 a barrel, before falling below $40 in December . Deirdre Michie, of industry lobby group Oil & Gas UK, said: 'The plummeting oil price has impacted heavily on activity. Companies are having to take very difficult

s down nearly 75 per cent since trading above $115 in mid-2014. Six months ago it dropped to $56.8 a barrel, before falling below $40 in December . Deirdre Michie, of industry lobby group Oil & Gas UK, said: `The plummeting oil price has impacted heavily on activity. Companies are having to take very difficult