The third show in the series, which saw the teams attempting to design and market a piece of home fitness equipment, pulled in 7.4m viewers and a 30.9% share of the 9pm-10pm audience.
'Grand Designs' came in second in the ratings battle with 2.6m viewers and a 10.7% share of the audience. Including Channel 4+1 figures it reached 2.8m viewers.
Last night's instalment saw presenter Kevin McCloud following the building of a big family house in the suburbs of Brighton, which he was uncharacteristically positive about.
ITV1's 'Superhuman: World's Tallest Children' documentary, featuring a 7ft 4in 13-year-old boy and the bespoke supersized home of Britain's tallest family, drew 2.4m viewers and a 10% share of the audience.
The programme explored how children cope with towering over their parents and the effects their height has on their health.
'Alan Whicker's Journey of a Lifetime', which saw Whicker tracking down a Hollywood plastic surgeon and his favourite patient - his wife, attracted 1.5m viewers and a 6.3% share of the audience.
Five's 'Extraordinary People: The World's Heaviest Man Gets Married' documentary, revisiting morbidly obese Mexican Manuel Uribe as he prepared for his wedding day, netted 1m viewers and a 4.1% share of the audience.
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