The stars align for Celebrity Gogglebox. Comedy legend Stephen Merchant shows viewers how their donations are put to work, Gary Lineker opens up about his family's brush with cancer, Tom Walker performs his hit single Leave a Light On, and a galaxy of stars - including Killing Eve's Jodie Comer, Mamma Mia's Lily James, Game of Thrones' Sophie Turner, Downton Abbey's Michelle Dockery and Hollywood heavyweight Liam Neeson throw their weight behind the campaign.