Sir John Arnold Clark (27 November 1927 – 10 April 2017) was a Scottish billionaire businessman. Clark opened a showroom in Glasgow in 1954 and found some success selling cars. He expanded his business and Arnold Clark Automobiles became a nationwide chain of motor dealerships and the largest privately owned business in Scotland. Clark kept his business family-owned for more than sixty years, remaining the chairman and chief executive. In 2016 he became the first billionaire car dealer in Britain. Wikipedia
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