Kieran has been loyal to Paula through a very difficult period.
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He's the only one who knows the pain she's hiding and has been sworn to secrecy.
He's tried to get outside help but Paula won't allow it. With no-one to confide in, Kieran's marriage is on a knife edge.
Navin was born and raised in Bristol. He made his professional debut aged 15 in John Schlesinger's critically-acclaimed film Madame Sousatzka, starring alongside Shirley MacLaine and Peggy Ashcroft. Several films followed co-starring with actors such as Peter O'Toole and Nigel Hawthorne.
In 1994, Navin graduated from a bio-chemistry degree from Imperial College London, after which he went on to play Kurt in Channel 4's drama Teachers and Raph in Channel 4's Ny-Lon.
Other recent TV work includes Dalziel And Pascoe, Judge John Deed, Waking The Dead and A Touch Of Cloth. He played Anwar in the critically acclaimed BBC TV series Doctor Foster.