The Guardian | Tullow Oil vows to cut costs further after $1bn pre-tax loss The Guardian Exploration company Tullow Oil has promised to its cut costs further after posting a $1bn (£690m) pre-tax loss, blaming rock-bottom oil prices. Revenues fell 27% to $1.6bn, forcing Tullow to write off $749m in exploration costs and slash the value of ... CompaniesTullow Oil narrows losses despite oil slide Tullow Oil slumps to £1bn loss Tullow Oil to slash spending by two-thirds after $1bn loss |