Guest Stars Ambika Mod as Shruti Rory Fleck Byrne as Harry Philippa Dunne as Ria Tom Durant-Pritchard as Greg Josie Walker as Non-Reassuring Trace Harriet Walter as Veronique Ashley McGuire as Ms. Houghton Alice Orr-Ewing as Emma Bally Gill as Dave Anil Goutam as Shruti's Dad George Somner as Al Mita Rahman as Shruti's Mum Sophie Winkleman as Kathleen Heather Coombs as Supermarket Supervisor Nansi Nsue as Triage Patients Lucy Russell as Serena Helen Phillips as Triage Patients Sara Hazemi as Triage Patients Angelica Sacrepaye as Triage Patients Jade Johnson as Triage Patients Harki Bhambra as Huck