BP P.L.C., formerly British Petroleum, is a British multinational oil and gas company headquartered in London.
 It is one of the world's seven oil and gas "supermajors", whose performance in 2012 made it the world's sixth-largest oil and gas company, the sixth-largest energy company by market capitalization and the company with the world's twelfth-largest revenue (turnover).
 It is a vertically integrated company operating in all areas of the oil and gas industry, including exploration and production, refining, distribution and marketing, petrochemicals, power generation and trading.
 It also has renewable energy interests in biofuels and wind power.
The Miller oilfield is a deep reservoir under the North Sea, 240 kilometres north-east of Peterhead in UKCS Blocks 16/7b and 16/8b.
 It was discovered in 1983 by BP in a water depth of 100 metres.
 Production from Miller field started in June 1992, and plateau production was from late 1992 to 1997 at rates of up to 150000 oilbbl of oil and 255 mmscf of gas per day.
 Miller produced some 345 Moilbbl of oil during its lifetime.
Statoil ASA, (), is a Norwegian multinational oil and gas company headquartered in Stavanger, Norway.
 It is a fully integrated petroleum company with operations in thirty-six countries.
 By revenue, Statoil is ranked by "Forbes Magazine (2013)" as the world's eleventh largest oil and gas company and the twenty-sixth largest company, regardless of industry, by profit in the world.
 The company has about 20,500 employees.
Oil and Natural Gas Corporation Limited (ONGC) is an Indian multinational oil and gas company headquartered in Dehradun, Uttarakhand, India.
 It is a Public Sector Undertaking (PSU) of the Government of India, under the administrative control of the Ministry of Petroleum and Natural Gas.
 It is India's largest oil and gas exploration and production company.
 It produces around 77% of India's crude oil (equivalent to around 30% of the country's total demand) and around 62% of its natural gas.
Kirkuk Field is an oilfield near Kirkuk de facto Kurdistan, de jure Iraq.
 It was discovered by the Turkish Petroleum Company at Baba Gurgur ("St. Blaze" in Kurdish) in 1927.
 The oilfield was brought into production by the Iraq Petroleum Company (IPC) in 1934 when 12-inch pipelines from Kirkuk to Haifa and Tripoli (Lebanon) were completed.
 It has ever since remained the most important part of northern Iraqi oil production with over 10 Goilbbl of proven remaining oil reserves in 1998.
 After about seven decades of operation, Kirkuk still produces up to 1 Moilbbl/d , almost half of all Iraqi oil exports.
 Oil from the Kirkuk oilfield is now exported through the Kirkuk-Ceyhan Oil Pipeline, which runs to the Turkish port of Ceyhan on the Mediterranean Sea.
The State Oil Company of Azerbaijan Republic (SOCAR) (Azerbaijani: "Azərbaycan Respublikası Dövlət Neft Şirkəti" ) is a wholly state-owned national oil and gas company headquartered in Baku, Azerbaijan.
 The company produces oil and natural gas from onshore and offshore fields in the Azerbaijani section of the Caspian Sea.
 It operates the country's two oil refineries, one gas processing plant and runs several oil and gas export pipelines throughout the country.
 It owns fuel filling stations under the "SOCAR" brand in Azerbaijan, Georgia, Ukraine, Romania and Switzerland.
 The company has about 70,000 employees.
GA Drilling (former Geothermal Anywhere) is a high technology company headquartered in Bratislava (Slovakia) with branches in London (UK) and Houston (USA).
 The company was founded in 1994 and rebranded as GA Drilling in August 2013.
 GA Drilling is developing and commercializing PLASMABIT technology platform which provides drilling and milling tool for challenging the most comprehensive industry issues.
 PLASMABIT is based on high-energy electric plasma enabling to operate at a constant speed with no need for changing tool.
 PLASMABIT applications are primarily addressed to oil and gas, geothermal energy and mining industries.
 Technology development is assisted by companies operating in oil and gas business.
 Main actors are identified as O&G Operators, Oilfield Service Providers, Energy Utilities and companies providing decommissioning of oil and gas structures.
 GA Drilling is also active within drilling community through participation at several industry events.
The Aliso Canyon Oil Field (also Aliso Canyon Natural Gas Storage Field, Aliso Canyon Underground Storage Facility) is an oil field and natural gas storage facility in the Santa Susana Mountains in Los Angeles County, California, north of the Porter Ranch neighborhood of the City of Los Angeles.
 Discovered in 1938 and quickly developed afterward, the field peaked as an oil producer in the 1950s, but has remained active since its discovery.
 One of its depleted oil and gas producing formations, the Sesnon-Frew zone, was converted into a gas storage reservoir in 1973 by the Southern California Gas Company, the gas utility servicing the southern half of California.
 This reservoir is the second-largest natural gas storage site in the western United States, with a capacity of over 86 billion cubic feet of natural gas.
 Currently it is one of four gas storage facilities owned by Southern California Gas, the others being the La Goleta Gas Field west of Santa Barbara, Honor Rancho near Newhall, and Playa del Rey.
InterNorth Inc. was a large energy company headquartered in Omaha, Nebraska, in the United States, specializing in natural gas pipelines but also a force in the plastics industry, coal and petroleum exploration and production.
 They operated the largest natural gas pipeline in North America (approximately 36,000 miles of pipeline) formed in 1979 as a holding company for Northern Natural Gas Company (founded in 1931), Northern Liquid Fuels Company, Northern Petrochemicals Company, Northern Propane Gas Company, Northern Border Pipeline Company, and People's Natural Gas.
 InterNorth was briefly renamed HNG/Internorth in 1985, following its takeover of Houston Natural Gas Company.
 It was renamed Enteron briefly, before the naming people discovered there was a conflict.
 The name was changed to Enron Corporation just six months later.
Oilfield scale inhibition is the process of preventing the formation of scale from blocking or hindering fluid flow through pipelines, valves, and pumps used in oil production and processing.
 Scale inhibitors (SIs) are a class of specialty chemicals that are used to slow or prevent scaling in water systems.
 Oilfield scaling is the precipitation and accumulation of insoluble crystals (salts) from a mixture of incompatible aqueous phases in oil processing systems.
 ‘Scale’ is a common term in the oil industry used to describe solid deposits that grow over time, blocking and hindering fluid flow through pipelines, valves, pumps etc. with significant reduction in production rates and equipment damages.
 Scaling represents a major challenge for flow assurance in the oil and gas industry.
 Examples of oilfield scales are calcium carbonate, iron sulfides, barium sulfate and strontium sulfate.
 Scale inhibition encompasses the processes or techniques employed to treat scaling problems.

Question: The Miller oilfield was discovered by an oil and gas company headquartered in which city ?
Answer: London