Question: What city is the company in that Gopichand Parmanand Hinduja's a co-chairman of?

Context paragraphs:
S. P. Hinduja: Srichand Parmanand Hinduja (born 28 November 1935) is an Indian-born British billionaire business magnate, investor, and philanthropist.  He is the primary shareholder and chairman of Hinduja Group of companies.  As of May 2017, together with his brother Gopichand he is the UK's richest man.  Since the 1990s, he has been consistently ranked among the UK and Asia's wealthiest people.  In May 2017, Hinduja topped the "Sunday Times" Rich List with an estimated wealth of GBP 16.2 billion ($21 billion).  Based on the rich list compiled by Asian Media & Marketing Group, Hinduja's wealth is estimated at GBP 19 billion ($24.7 billion).  The "Forbes" List in March 2016 ranked him and his brother GP as the world's 58th richest billionaire family with an estimated wealth of $16.4 billion.

Gopichand Hinduja: Gopichand Parmanand Hinduja (born 29 February 1940) is an Indian-born British billionaire businessman, the co-chairman of the Hinduja Group.  As of May 2017, together with his brother Srichand he is the UK's richest man.  Since the 1990s, he has been consistently ranked among the UK and Asia's wealthiest people.  In May 2017, Hinduja topped the "Sunday Times" Rich List with an estimated wealth of GBP 16.2 billion ($21 billion).  Based on the rich list compiled by Asian Media & Marketing Group, Hinduja's wealth is estimated at GBP 19 billion ($24.7 billion).  The "Forbes" List in March 2016 ranked him and his brother GP as the world's 58th richest billionaire family with an estimated wealth of $16.4 billion.

Prakash Hinduja: Prakash Parmanand Hinduja (born June 1945) is an Indian-born Swiss businessman, the chairman of the Hinduja Group in Europe.

Hinduja Bank (Switzerland): Hinduja Bank (Switzerland) Ltd was founded as a finance company in 1978 and became a Swiss regulated bank in 1994.  Hinduja Bank has its headquarters in Geneva and has a developed network in Switzerland including offices in Zurich, Lugano, St Margrethen, and Basle.  Additionally, it has a global presence in London, Dubai, Paris, New York City, Mauritius, and Chennai.

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.

Supporting paragraphs: Gopichand Hinduja Hinduja Group
Answer: London