'Amy Winehouse: What Really Happened?', in which journalist Jacques Peretti attempted to separate the truth from the myth surrounding Camden's resident diva and tabloid favourite, attracted an 11% share of the audience between 10pm-11.05pm.
Including Channel 4+1's time-shifted audience, the ratings rose to 2m viewers and a 12% share.
Earlier in the evening, the third instalment of 'Grand Designs Live', which is being shown over six consecutive evenings, was watched by 1.9m viewers and an 8.2% share between 9pm-10pm.
The programme, in which presenter Kevin McCloud has six days to build his own Grand Design with the series broadcast live from the two-storey house that he hopes will prove a testament to sustainable living, drew 2m viewers and an 8.8% share including Channel 4+1 figures.
Elsewhere, the concluding part of a 'Waking the Dead' two-part special oabout the murder of a neo-Nazi won the 9pm slot for BBC One with 6.1m viewers and a 27.2% share.
ITV1 had the second most-watched programme in the 9pm-10pm slot, with 3.7m viewers and a 16.4% share tuning into a documentary about overweight children called 'Too Fat to Toddle'.
Five's US import 'CSI: Crime Scene Investigation' netted a solid 2.3m viewers and a 10.4% share between 9pm-10pm.