Guest Stars Yani Alekansandrov as Humphrey's Body Paul Cawley as Dead Doctor Angela Yeoh as Doctor Uncredited Lolly Adefope as Boiler Room Ghost Martha Howe-Douglas as Boiler Room Ghost Laurence Rickard as Nigel (Boiler Room Ghost) Jim Howick as John (Boiler Room Ghost) Ben Willbond as Boiler Room Ghost Mathew Baynton as Mick (Boiler Room Ghost) Simon Farnaby as Boiler Room Ghost Katy Wix as Boiler Room Ghost