What is the relationship between Petrofac and London in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

INTERNATIONAL ECONOMIC ANNOUNCEMENTS Balance of Trade (EU) (10:00) Business Inventories (US) (13:30) Capacity Utilisation (US) (14:15) Industrial Production (US) (14:15) Manufacturing Inventories (US) (15:00) New Car Registrations (EU) (10:00) Retail Sales (US) (15:00) Retail Sales Inventories (US) (13:30) ZEW Survey (EU) (10:00) ZEW Survey (GER) (10:00) FINALS Gateley (Holdings) , Wilmington EGMS Public Joint Stock Company Severstal GDR (Reg S) AGMS Aberdeen Private Equity Fund Ltd. Sterling Part Shares, Ebiquity (LSE: EBQ.L - news ) , Enteq Upstream (Other OTC: ENQQF - news ) , NCC Group (LSE: NCC.L - news ) , VietNam Holding Ltd UK ECONOMIC ANNOUNCEMENTS Consumer Price Index (09:30) Producer Price Index (09:30) Retail Price Index (09:30) Wednesday 16 September INTERIMS Anpario (LSE: ANP.L - news ) , Cello Group (LSE: CLL.L - news ) , Deltex Medical Group, Epwin Group (LSE: EPWN.L - news ) , JD Sports Fashion (LSE: JD.L - news ) , M. P. Evans Group, Mi-Pay Group, Quixant (LSE: QXT.L - news ) , Real Estate Investors, SafeCharge International Group Limited (DI (KSE: 003160.KS - news ) ), Smart Metering Systems (LSE: SMS.L - news ) , Synairgen (LSE: SNG.L - news ) , Vislink INTERIM DIVIDEND PAYMENT DATE Hiscox Limited (DI), Rentokil Initial (Other OTC: RKLIF - news ) QUARTERLY PAYMENT DATE Utilico Investments Ltd (DI) INTERNATIONAL ECONOMIC ANNOUNCEMENTS Consumer Price Index (EU) (10:00) Consumer Price Index (US) (13:30) Crude Oil Inventories (US) (15:30) Harmonised Index of Consumer Prices (EU) (10:00) MBA Mortgage Applications (US) (12:00) GMS Hotel Corporation (The) FINALS Avanti Communications Group, Eagle Eye Solutions Group, Galliford Try (LSE: GFRD.L - news ) AGMS Entertainment One Limited (Other OTC: ENTMF - news ) , Gail (India) Ltd GDR (Reg S), Games Workshop Group, Hornby (LSE: HRN.L - news ) , Intercede Group (LSE: IGP.L - news ) , ITM Power (LSE: ITM.L - news ) , React Group (LSE: REAT.L - news ) , Terra Catalyst Fund (DI), Trifast UK ECONOMIC ANNOUNCEMENTS Claimant Count Rate (09:30) Unemployment Rate (09:30) Thursday 17 September INTERIMS Elecosoft (LSE: ELCO.L - news ) , IndigoVision Group (LSE: IND.L - news ) , Premier Farnell (LSE: PFL.L - news ) , Safestyle UK (LSE: SFE.L - news ) INTERIM DIVIDEND PAYMENT DATE Amino Technologies (LSE: AMO.L - news ) , Anglo American (LSE: AAL.L - news ) , Legal & General Group, Mobeus Income & Growth Vct (LSE: MIX.L - news ) INTERIM EX-DIVIDEND DATE Action Hotels (LSE: AHCG.L - news ) , Antofagasta (Other OTC: ANFGF - news ) , Ashley (Laura) Holding, BBA Aviation (LSE: BBA.L - news ) , Belvoir Lettings (LSE: BLV.L - news ) , Computacenter (LSE: CCC.L - news ) , Costain Group (LSE: COST.L - news ) , Derwent London (LSE: DLN.L - news ) , Highcroft Investment, Indivior (LSE: INDV.L - news ) , International Public Partnerships Ltd., Interserve (LSE: IRV.L - news ) , Irish Continental Group Units, Maintel Holdings (LSE: MAI.L - news ) , Martinco , Molins (LSE: MLIN.L - news ) , Neptune-Calculus Income & Growth VCT, New Europe Property Investments, Octopus AIM VCT (LSE: OOA.L - news ) 2, Petrofac Ltd., Phoenix Spree Deutschland Limited SHS NPV , Primary Health Properties (LSE: PHP.L - news ) , Puma High Income VCT (LSE: PMH.L - news ) , RPS Group (LSE: RPS.L - news ) , Total Produce (LSE: TOT.L - news ) , Tribal Group (LSE: TRB.L - news ) INTERNATIONAL ECONOMIC ANNOUNCEMENTS Balance of Payments (US) (13:30) Building Permits (US) (13:30) Continuing Claims (US) (13:30) Current Account (US) (13:30) ECB Report (EU) (09:00) FOMC Interest Rate (US) (19:00) Housing Starts (US) (13:30) Initial Jobless Claims (US) (13:30) Philadelphia Fed Index (US) (15:00) FINALS Brooks Macdonald Group, Just Retirement Group, Kier Group (LSE: KIE.L - news ) , Town Centre Securities (LSE: TCSC.L - news ) IMSS Merlin Entertainments (LSE: MERL.L - news ) SPECIAL EX-DIVIDEND PAYMENT DATE Hargreaves Lansdown (LSE: HL.L - news ) AGMS 600 Group, Accsys Technologies (Other OTC: ACSYF - news ) , Auto Trader Group , Avengardco Investments Public Ltd GDR, Colefax Group (LSE: CFX.L - news ) , Marechale Capital (LSE: MAC.L - news ) , Northgate (Other OTC: NGTEF - news ) , Poundland Group (Other OTC: PDLDF - news ) , Safeland TRADING ANNOUNCEMENTS Investec UK ECONOMIC ANNOUNCEMENTS Internet Retail Sales (09:30) Retail Sales (09:30) FINAL DIVIDEND PAYMENT DATE red24 FINAL EX-DIVIDEND DATE AdEPT Telecom (LSE: ADT.L - news ) , Avation (LSE: AVAP.L - news ) , Ebiquity, Hargreaves Lansdown, Henderson Smaller Companies Inv Trust, Mattioli Woods (LSE: MTW.L - news ) , Newmark Security PLC (LSE: NWT.L - news ) , Poundland Group , Renishaw (Other OTC: RNSHF - news ) , Trifast (Other OTC: TFSTF - news ) , UniVision Engineering Ltd.

Answer: headquarters_location