Guest Stars Fiona Dolman as Sarah Barnaby Tamzin Malleson as Dr. Kate Wilding Elizabeth Berrington as Liberty "Libs" Pearce James Murray as Ollie Tabori Hannah Tointon as Pippa Fergus-Johnson Mark Heap as Simon Fergus-Johnson Nikesh Patel as Dev Kardek Les Dennis as Brendan Pearce Emily Joyce as Valerie Fergus-Johnson Perdita Avery as Felicity Hearn Paul Blair as Ross Clymer Jonah Russell as Conor Bridgeman Nadia Cameron-Blakey as Tabby Fergus-Johnson Susie Trayling as Mel Bridgeman