According to unofficial overnight figures, the WWII police drama series starring Michael Kitchen brought in 7.4m viewers or a 34.6% share, trouncing the big budget epic 'Superstorm', which only returned an audience of 3.8m viewers or a 15.8% share, despite the presence of Hollywood actor Tom Sizemore.
The BBC drama was part of an overall poor ratings day for the corporation's flagship channel, which only managed to register an average share of 14.6% all day on Sunday in its lowest figures since the upgrading of the Barb official television measurement system.
The poor showing for BBC One appeared to mainly benefit ITV1, as rival channels had little to offer in the way of strong alternatives to the homefront Second World War drama.
On BBC Two, nature programme 'Deer Diary' attracted 1.6m, or a 6.6% share, while on Channel 4, a repeat of the Sofia Coppola film 'Lost in Translation' starring Bill Murray and Scarlett Johansson pulled in 1.3m or a 6.1% share.
On Five, between 9pm and 10pm the second in a double bill of medical drama 'Grey's Anatomy' starring Patrick Dempsey mustered an average of 980,000 viewers, not even making it past the 1m mark.
The fifth terrestrial channel will be hoping for a better performance from 'Grey's Anatomy' in future as it announced today that it has signed a contract with the series' maker Buena Vista International to bring it back to the channel for a third season.
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