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There are some obstacles to deal with as the team tackle one of their trickiest cases yet.
Lennie James
Glen Boyle
Catherine Walker
Fiona Lomas
Kimberley Nixon
Dr Harry Bennett Edwards
Neve McIntosh
Nicola Hicklin
Prasanna Puwanarajah
Ramakrishna Chandramohan
John Macmillan
Justin Costello
Ellen Thomas
Constance Campbell
Mali Harries
Nerys Merrick
Paul Bazely
Giles Dhillon
Danny Kirrane
Billy Finlay
Peter Sullivan
Clive Archerfield
Emma Fryer
Rebecca Osgood
Claire Skinner
Lorraine Rappaport
Tim Faraday
Bob