The actors beat stiff competition from the likes of Cilla's Sheridan Smith, Sherlock's Benedict Cumberbatch and The Missing's James Nesbitt, with all three hotly-tipped shows failing to pick up a gong all night.
Both Campbell and Watkins' roles were hard-hitting, with Campbell playing a teenage domestic violence victim in a drama based on a real-life story and Watkins playing the retired schoolteacher wrongly-accused of murdering Joanna Yeates.
Tonight's star-studded ceremony, hosted by Graham Norton for the night time, also saw Channel 4 News journalist Jon Snow given the Fellowship, the highest accolade that Bafta can bestow.
Marvellous and The Lost Honour of Christopher Jefferies emerged as the big winners, picking up two awards each, while Jeff Pope and Clive James were given special awards.
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