Happy Valley is without any doubt one of the best BBC drama of the decade, if not ever and after nearly seven years away, it is back for its third and final series on Sunday night.
A very different role for ex Coronation Street barmaid Sarah Lancashire, sergeant Catherine Cawood has had the nation on the edge of its seat in the first two series of the Sally Wainwright drama, largely down to her troubles with Tommy Lee Royce, the man who raped her daughter Becky, with her then killing herself as she struggled to get over the trauma.
The first series saw recently released from prison Tommy nearly kill Catherine in a violent house confrontation, before he ended up back behind bars at the start of Happy Valley series two, with them coming face to face again in a fraught stand-off at his mum's funeral. And, even though he was locked up, Tommy still had an influence over son Ryan, as a woman obsessed with him faked her identity to become a classroom assistant at Ryan's school, before trying to urn the youngster against grandmother Catherine.
