Sally Wainwright's gritty drama starring Sarah Lancashire and James Norton made a highly anticipated return on New Year's Day after six years off air, and fans were not willing to miss episode two even to hear the ins and outs of Prince Harry's rivalry with brother Prince William.
Overnight TV ratings figures from the Broadcasters Audience Research Board (BARB) show that BBC One's Happy Valley, which began airing at the same time as Tom Bradby's much-publicised interview with Harry for ITV1, was ahead with more than a million more viewers.
BARB figures show that 5.25 million viewers tuned in to Happy Valley at 9pm on Sunday, while 4.1 million opted for Harry's interview.
They also show that BBC One's preceding show, Call The Midwife, beat both programmes' viewing figures at 8pm as 5.61 million watched the cosy period drama.
Harry sat down with Bradby to discuss some key claims from his forthcoming autobiography Spare, including accusations that Prince William grabbed him by the collar and pushed him into a dog bowl during an argument about his relationship with Meghan Markle.
The prince also said that his father, King Charles, had not been suited to life as a single parent and denied that he and wife Meghan had accused any royals of racism during their now-infamous interview with Oprah Winfrey, claiming instead that they were talking about "unconscious bias".
Meanwhile, Happy Valley viewers followed police officer Catherine Cawood's (Lancashire) ongoing struggles against Halifax's drug problem, as well as her battle with the imprisoned Tommy Lee Royce (Norton).
A key part of the series three storyline has been Catherine's grandson Ryan visiting his estranged father Tommy in prison, and a mystery over who has been facilitating the visits.
This will be the final season of Happy Valley, which is expected to reach a dramatic conclusion between Catherine and Tommy.
Call The Midwife also aired its second episode of the series and is currently into season 12 of the show.
Harry's ITV1 interview wasn't his only media appearance last night as he also kicked off his US TV round of promotion for Spare with Andrew Cooper on CBS’s 60 Minutes programme.