INTERQUEST Announces Speakers for 2015 London Digital Book Printing Forum Distinguished Lineup of Executives from the U.K. & Around the World Slated to Speak at Sixth Annual Event  Annick Boizard INTERQUEST 434-979-9945 (Phone) 434-979-9959 (Fax) press@inter-quest.com Charlottesville, VA and London, U.K. (June 15, 2015) —INTERQUEST, a leading market and technology research and consulting firm serving the digital printing and publishing industry, today announced speakers for the 2015 London Digital Printing Forum, which will be held Thursday, June 25, 2014 at the Royal Society,…