Naman Ramachandran The finale of “Britain’s Got Talent” will feature performances from the combined companies of “Les Misérables – The Staged Concert,” “The Phantom of the Opera” and “Mary Poppins,” presented by renowned theater producer Cameron Mackintosh.Ant and Dec will host while Amanda Holden, Alesha Dixon, David Walliams and Ashley Banjo will be on judge duty.The popular ITV show, created by Simon Cowell, took place this year largely without his physical participation as he broke his