The detective drama, starring Dennis Waterman and Amanda Redman, has had consistently high ratings and won the primetime slot again for BBC One attracting a 35.9% share of the 9pm-10pm audience.
Last night's episode, the penultimate in the series, saw the team reopen the case of a murdered student, whose body was found on wasteland.
'Dragon's Den', which last night included pitches for a website for foodies and a magic whiteboard, pulled in 3.6m viewers on BBC Two and a 14.3% share of the 9pm-10pm audience.
It beat ITV1's 'Superhuman: Genius' documentary looking at gifted people in music, science and arts, which netted 3.3m viewers and a 13.5% share of the prime-time slot.
The second episode of Channel 4's 'Kevin McCloud and the Big Town Plan', which sees the presenter following a community-led regeneration scheme in a former mining town in Yorkshire, attracted 1.1m viewers and a 4.5% share of the 9pm audience. Including Channel 4+1 figures it reached 1.3m viewers and a 5.2% share.
Five drew 657,000 viewers and a 3.1% share of the 9pm-11pm audience for its repeat of clips show 'Before They Were Stars: Greatest TV Moments'.
'The Hairy Bakers', formerly known as 'The Hairy Bikers', returned to BBC Two last night pulling in 3.7m viewers and a 15.5% share of the 8.30pm-9pm audience.
The first episode in the series saw hairy bakers Dave Myers and Simon King riding around the north of England making a selection of breads including brown ale loaf and barley stotty.
Later in the evening 'Big Brother' attracted 2.9m viewers and a 15.9% share of the 10pm-11pm audience for Channel 4. Including Channel 4+1 figures it managed 3m viewers and a 16.7% share.
The Olympics coverage on BBC One attracted 2.6m viewers and a 38.1% share of the audience between 9am and 12pm. The afternoon's coverage netted 3.2m viewers and a 34.6% share of the 12.45pm-5.15pm audience.
The highlights programme 'The Games Today' on the same channel drew 5.3m viewers and a 25.7% share of the 7pm-8pm audience.
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