Mark Bonnar - Colin Osborne

Colin Osborne is a highly-respected defence barrister who takes on a lot of pro-bono and community work, deeply caring about his clients. He lives in Brighton with his husband Simon: they're in the final stages of adopting a young girl, Flora. Before becoming a barrister, Colin worked in London as a high-flying banker.

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From Line of Duty's Mike Dryden to Catastrophe's Chris and New Blood's Peter Mayhew, we've seen a lot of Mark Bonnar on our TV screens over the years. The Shetland and Pyschoville star also appeared as Casualty's Bruno Jenkins. Oh and you may have spotted him in the likes of PhoneShop, Doctor Who and Home Fires.

Charlie Condou - Simon

Colin's partner Simon seems blissfully unaware of his partner's woes and is fully focussed on bringing home their adopted daughter.

Fans of Coronation Street will immediately recognise Condou as Coronation Street's Marcus Dent, but he had roles in the likes of Martin Chuzzlewit, Pie in the Sky, The Bill, Peak Practice and Urban Gothic long before that. He played Jonatton Yeah? in the Channel 4 sitcom, Nathan Barley, and made guest appearances in a number of British TV series including The Infinite Worlds of HG Wells, and Midsomer Murders.

Josef Altin - Tyler

The mysterious figure seems to be following Colin and Simon – but why?

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Game of Thrones fans will be familiar with Atlin, who played Pypar in the HBO series. And Nicola Walker fans will recognise him from his appearance in crime drama River last year. He has also popped up in Him & Her, Misfits and Being Human, as well as starring in a series of films including Les Miserables, Child 44, Eastern Promises and Boy A.

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