Question: Where was the Indian conglomerate company who owned Ashok Leyland headquatered? 

Context paragraphs:
JanBus: JanBus is heavy duty passenger bus manufactured by Ashok Leyland. This bus uses the modern technologies to reduce the pollution according to the new rules and policy of environmental pollution control, in comparison to other models of bus launched by Ashok Leyland this bus has unique features like a long body, wider space for standing passengers, a cantilever chair and fully flat flooring.

Ashok Leyland Stallion: The Stallion range of trucks is produced by Ashok Leyland Defence Systems (ALDS) for the Indian Armed Forces.

Ashok Leyland MiTR: Ashok Leyland MiTR (or MiTR) is a Minibus manufactured by Ashok Leyland in Joint venture with Nissan.  The vehicle was unveiled in Jan 2014 during the 12th Auto Expo 2014 and was launched in Jul 2014.

Leyland Comet: The Leyland Comet was a long running badge used by Leyland for a series of trucks (and the occasional bus) intended mainly for export markets.  The name lives on in India, where Ashok Leyland still uses the badge today.

S. V. S. Raghavan: S. V. S. Raghavan is an Indian industrialist and the former head of Bharat Business International Limited (BBIL).  He headed the Bharat Heavy Electricals Limited in the 1980s after which served Ashok Leyland and Texmaco before taking up the chairmanship of Minerals and Metals Trading Corporation (MMTC).  In March 1990, he was appointed as the chairman of BBIL, an apex organization which had MMTC and State Trading Corporation of India (STC) as its subsidiaries.  Recipient of National Citizen Award by the President of India-1989, Retired in the rank of Secretary in Ministry of Commerce,Govt.of India, Chairman of the Committee on Competition Law & Policy, Retired Member of the Indian Defence Accounts Services.

Shaktiman truck: Shaktiman trucks were the most widely used medium-capacity trucks of the Indian Armed Forces.  They were manufactured between 1959 and 1996 by the Vehicle Factory Jabalpur, (VFJ) of the Indian Ordnance Factories Board.  Nearly all the Shaktimans have been phased out and replaced by Ashok Leyland Stallion and Tata LPTA 713 4x4s.  Only about 7,000 Shaktimans remain compared to more than 60,000 Stallions MkIII and 28,000 Tata 713s.  The Stallion MkIII itself is now being replaced by the Stallion MkIV

Ashok Leyland: Ashok Leyland is an Indian automobile manufacturing company headquartered in Chennai, India.  It is owned by the Hinduja Group.

Hinduja Group: The Hinduja Group is an Indian conglomerate company headquartered in London, United Kingdom.  They are involved in a wide range of activities including foundries, import export, trading, motor vehicles, banking, call centres and healthcare.

Ashok Leyland STiLE: Ashok Leyland STiLE (or STiLE) was a minivan manufactured by Ashok Leyland.  The vehicle was unveiled during the 2012 Auto Expo and was launched in July 2013.  STiLE was produced as a "minivan" to be used as a commercial vehicle (hotel shuttles, taxi, ambulances, panel van, courier service, inter-city) and for intra-city travel.  In May 2015, Ashok Leyland stopped production of the vehicle due to low demand for the model.

Rane (Madras): Rane (Madras) Ltd is a part of the Rane Group of Companies involved in the manufacture and distribution of steering and suspension systems.  The main components manufactured by the company include Manual Steering Gear Products (SGP) and Suspension & Steering Linkage Products (SSLP).  The other products include tie rod assemblies, drag link assemblies, center link assemblies and gear shift ball joints.  Automobile companies that use its products include Ashok Leyland, Volvo, M&M, Tafe, Tata among many others.  Tata motors remains its major customer and is the primary parts manufacturer for Tata's Nano.  The company has also set up a dedicated plant for Tata Nano in Sanand, Gujarat.  The company was forced to change its manufacturing facility from West Bengal to Gujarat after Tata moved out.

Supporting paragraphs: Ashok Leyland Hinduja Group
Answer: London, United Kingdom