ProductionOPINION: Ghana complexities take toll on Tullow and Aker EnergyHit and miss: while local player Springfield E&P this week wheeled out a sparkling set of in-place resource numbers for its Afina discovery off Ghana, difficulties in the country’s offshore saw the chief executives of Tullow Oil and Aker Energy lose their jobs.Foto: RYTIS DAUKANTAS/UPSTREAMEoin O'CinneideLondon