It's been a bumpy road getting series two of Back made. The sitcom was a success when it first aired on Channel 4 in 2017. But, when everyone finally got back together to film new episodes in 2019, a routine medical for insurance saw star Robert Webb discover he was suffering from a heart murmur, caused by a mitral valve prolapse. He was told he needed urgent surgery to save his life. Undated Handout Photo from Back. Pictured: (L-R) Robert Webb as Andrew, David Mitchell as Stephen. See PA Feature SHOWBIZ TV Quickfire Mitchell Webb. Picture credit should read: PA Photo/Channel 4. WARNING: This picture must only be used to accompany PA F