KEY POINTS
Larry Valenstein (left) and Arthur Fatt founded Grey Advertising in 1917

The London arm of a global advertising agency has changed its name to those of its Jewish founders to "make a statement against intolerance and prejudice," and says it is doing so in the wake of recent events including last week's terror attack in London's Westminster.

Grey London will become Valenstein & Fatt for 100 days, named after its Jewish founders Larry Valenstein and Arthur Fatt, who launched the original agency in New York in 1917.