Guest Stars Martin Compston as Marcus Georgina Campbell as Young Serena Sara Powell as Fez Michael McElhatton as Brian Holli Dempsey as Young Poppy Kathy Kiera Clarke as Marlene Nicholas Pinnock as Evan Eleanor Methven as Liz Bryan Dick as Al Owen Roe as Jim Doña Croll as Rachel Dylan Tighe as Poppy's Lawyer Laura Jane Laughlin as Serena's Lawyer Dominique Jackson as Vee