Guest Stars Orla Russell as Poppy Lois Chimimba as Tara Kierly Bobby Rainsbury as Cronin Cristian Ortega as Anderton Martin Compston as Chief Petty Officer Craig Burke Reuben Joseph as Porter Anita Vettesse as Petty Officer Jackie Hamilton Tom Gill as Chief Petty Officer Adams Therese Bradley as Laura Michaels Oliver Lansley as Mark Hill Parth Thakerar as Jay Kohli Bhav Joshi as Chief Petty Officer Deerborne Suni La as GP Aileen Clarke as Journalist