'Appropriate Adult' stars Dominic West and Emily Watson have each carried off a Royal Television Society award for their performances in the drama about the killer Fred West.
Dominic West, who played the serial killer, was named Best Male Actor at the awards in central London.
The judges said he "shockingly, wittily and superbly captured the most horrific characteristic of a serial killer: his terrifying charm".
The other nominees were Daniel Rigby for the Morecambe and Wise biopic, 'Eric & Ernie', and John Simm for Exile.
Watson, who played the appropriate adult, Janet Leach, who gave the drama its title, was named Best Female Actor.
The judges said she was "subtle, nuanced and utterly compelling, an incredibly skilled and extraordinary portrayal of an ordinary woman by an actor at the height of her powers".
She beat 'This Is England' star Vicky McClure and Irish actress Ruth Negga, who played Shirley Bassey in 'Shirley', to the prize.
The ITV film was based on the little-known story of Ms Leach who was present throughout West's questioning by police as the scale of his crimes became evident.
The ceremony formally known as RTS Programme Awards, at Grosvenor House in Park Lane, was hosted by actor and comedian Rob Brydon.
Other awards saw wins for Gareth Malone who was named Best Presenter for his role in 'The Choir: Military Wives' and 'Coronation Street', which was named Best Soap and Continuing Drama.
The winner of Best Single Documentary went to the controversial 'Terry Pratchett: Choosing To Die'.
The BBC2 show, which followed the best-selling author as he examined the case for assisted suicide, was described as "groundbreaking, revelatory and profoundly moving".
Russell Tovey and Sarah Solemani won the Comedy Performance award for their roles in the BBC comedy 'Him and Her', with the judges praising their "perfect partnership" which they said was "understated but wickedly funny".
'Fresh Meat', which stars Jack Whitehall as a university student sharing a house with other undergraduates, was named Best Scripted Comedy.
The Lifetime Achievement Award went to Beryl Vertue OBE whose career started with classic comedy writers Galton and Simpson in the 1950s and who is still working now, counting the BBC hit 'Sherlock' - where she is executive producer - among her credits.
Vertue also worked as an agent for names including Tony Hancock and Spike Milligan.