14 May 2015

Question of the Day#455

As the fourth-largest agency network in the world, X is one of the key subsidiaries of the WPP Group. The company was founded by William James Carlton in 1864. Carlton's company was renamed by Mr.X after whom the company was named. It was acquired by WPP Group in 1987.
 In 2005, the agency was rebranded by shortening X to Y. In 2014, the agency celebrated its 150th anniversary and returned to its full name X.
Identify X and  Y ?

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