Guest Stars Dominic MacHale as Sergeant Healy Demi Isaac Oviawe as Linda Walsh Jennifer Barry as Siobhan Walsh P.J. Gallagher as Principal Barry Walsh Orla Fitzgerald as Orla Walsh Michael Sands as Jock's Dad Judy Donovan as Shopkeeper Cora Fenton as Jock's Mam Pat O'Connell as Mairead's Boss Joy Buckle as News Reporter Thomas McCarthy as Bike Thief Mick O'Driscoll as Man with Dog Szymon Saluga as Tattooist Darren Shanahan as Onlooker on Bridge April Kelly as Woman at Garda Station