Guest Stars Clare Calbraith as DC Rebecca "Shep" Shepherd Barbara Marten as Diane Barton Simon Chandler as Keith Barton John Duttine as Lt. Colonel Chapell Co Starring Sonya Cassidy as Celine Ashworth Mia Wyles as Jessie Ashworth Ben Aldridge as Alex Barton Ben Aldridge as Ollie Barton Steven Cree as Corporal Vince Grafton Alex Price as Lance Corporal "Budgie" O'Connor Naomi Bentley as Laura Deverson Barry McGee as Staff Sgt. "Dev" Deverson Adnan Sarwar as Sergeant Anna Bolton as Sergeant's Wife