What is the relationship between Ladbrokes 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.

INTERIM DIVIDEND PAYMENT DATE Aquatic Foods Group , Derwent London (LSE: DLN.L - news ) , Netplay TV (LSE: NPT.L - news ) , Premier Farnell (LSE: PFL.L - news ) INTERIM EX-DIVIDEND DATE BAE Systems (LSE: BA.L - news ) , Capita (LSE: CPI.L - news ) , Cello Group (LSE: CLL.L - news ) , Hansteen Holdings (LSE: HSTN.L - news ) , Harvey Nash Group (Other OTC: HVYNF - news ) , Howden Joinery Group, InterQuest Group (LSE: ITQ.L - news ) , Intu Properties (Other OTC: CCRGF - news ) , Marshalls (LSE: MSLH.L - news ) , Menzies(John), ProVen Growth & Income VCT, ProVen VCT, Rolls-Royce Holdings, Rotala (LSE: ROL.L - news ) , Senior (Other OTC: SNIRF - news ) , Tullett Prebon (LSE: TLPR.L - news ) , Walker Greenbank (LSE: WGB.L - news ) , William Hill (Other OTC: WIMHF - news ) QUARTERLY PAYMENT DATE Fair Oaks Income Fund Limited QUARTERLY EX-DIVIDEND DATE Assura (Swiss: OXAGR2.SW - news ) , City of London Inv Trust INTERNATIONAL ECONOMIC ANNOUNCEMENTS Consumer Confidence Indicator (EU) (10:00) Continuing Claims (US) (13:30) ECB Interest Rate (EU) (12:45) Existing Home Sales (US) (15:00) Initial Jobless Claims (US) (13:30) Leading Indicators (US) (15:00) GMS Belvoir Lettings (LSE: BLV.L - news ) IMSS Inchcape (Other OTC: IHCPF - news ) , Ladbrokes (LSE: LAD.L - news ) , Phoenix Group Holdings (DI), SEGRO (Other OTC: SEGXF - news ) , Travis Perkins (LSE: TPK.L - news ) SPECIAL EX-DIVIDEND PAYMENT DATE S&U (LSE: SUS.L - news ) , TR European Growth Trust EGMS FBD Holdings (Other OTC: FBDHF - news ) , Griffin Mining Ltd., Ryanair Holdings (Xetra: RY4B.DE - news ) AGMS Argos Resources Ltd. (DI), Ashmore Group (Other OTC: AJMPF - news ) , BHP Billiton (NYSE: BBL - news ) , Castleton Technology (LSE: CTP.L - news ) , Go-Ahead Group, Monitise (Other OTC: MNQQY - news ) , PME African Infrastructure Opportunities (LSE: PMEA.L - news ) , Standard Life UK Smaller Companies Trust TRADING ANNOUNCEMENTS Mail.ru Group Ltd GDR (Reg S) UK ECONOMIC ANNOUNCEMENTS Internet Retail Sales (09:30) Retail Sales (09:30) FINAL DIVIDEND PAYMENT DATE Oxford Instruments (Other OTC: OXGGY - news ) FINAL EX-DIVIDEND DATE Animalcare Group (LSE: ANCR.L - news ) , Bailey (C.H.

Answer: headquarters_location