Game Of Thrones star Lena Headey and Stan & Ollie actor Steve Coogan were among those to join an estimated one million anti-Brexit marchers in London on Saturday. Marching celebrities also included TV presenter Claudia Winkleman, actress Meera Syal, singer Billy Bragg and chef Delia Smith. Actor Patrick Stewart was among those to sponsor coaches bussing marchers to London while James Corden tweeted images from the march and voiced his support. The Put it to the People…