The show clinched a 16.5% share of the audience, eclipsing both BBC One’s Panorama and a drama-documentary on the life of Agatha Christie.
The 3.7 million viewers tuning in to Channel 4 saw another round of Brits attempting to set up home in Italy.
Panorama’s behind-the-scenes look at life for premature babies was watched by 3.6 million viewers and grabbed a 15.9% share.
However, BBC Two’s period drama-documentary on Christie, starring Olivia Williams and Bonnie Wright, faired even worse, with just 2.3 million viewers tuning in and a lowly 10.6 share of the audience.
Top prime time programme went to ITV1’s fire drama Steel River Blues, which brought in almost 5 million viewers and a 23.6% share of the audience, up almost 600,000 on its previous outing.
Earlier in the evening, both Coronation Street and Emmerdale posted impressive ratings of 10.7 and 8.5 million viewers respectively.
Both BBC One and Five also threw blockbuster movies into the evening schedule mix: The Wedding Singer (7.25pm), starring Adam Sadler and Drew Barrymore, attracted 3.5 million viewers, while The Pelican Brief, starring Denzel Washington and Julia Roberts, was watched by 1.7 million viewers.