Review "A powerful new play... important and disturbing." ? Scotsman Product Description Testing the Echo is a provocative and often satirical look at the overwhelming difficulty of defining what it is to be British. It asks crucial questions about whether fundamentalist Muslims can ever be truly assimilated into a society whose values and assumptions are so very different from their own.David Edgar is best known for his adaptation of Nicholas Nickleby and is the author of Pentecost. About the Author David Edgar is best known for his adaptation of "Nicholas Nickleby" for the RSC (revived in West End, Xmas 2007, Following UK tour), for whom he wrote "Destiny", "Dr. Jekyll and Mr. Hyde", "Pentecost" and "The Prisoner's Dilemma". His plays at the National include "The Shape of the Table", "Entertaining Strangers" with Judi Dench, and "Albert Speer".