Field_DevelopmentBP finally starts drilling at key deep-water oil project off AngolaUK supermajor drills with Valaris-owned drillship on Platina field, with tie-back due to nearby FPSOTie-back: BP's Greater Plutonio floating production, storage and offloading vessel moored in Block 18 off AngolaPhoto: BPEoin O'CinneideLondon