The first part of a 'Silent Witness' two-parter called 'Judgement', with storylines involving Hasidic Jews and Polish builders, attracted 6.3m viewers and a 26.4% share of the 9pm-10pm audience on BBC One.
That dwarfed ITV1's travel series 'Greatest Cities of the World with Griff Rhys Jones', which drew 3.3m viewers and a 13.6% share.
In the last programme in the series comedian Rhys Jones visited Paris, where he attempted to work as a waiter in a brasserie and explored the city's underground tunnels.
US drama 'Heroes', starring Milo Ventimiglia and Hayden Panettiere, pulled in 2.2m viewers on BBC Two and an 8.8% share of the 9pm-9.45pm audience. It was followed by 'Heroes Unmasked' which netted 1.4m viewers and a 5.9% share of the 9.45pm-10pm audience.
Channel 4's observational documentary 'The Family' attracted 1.9m viewers and a 7.7% share across the hour. Including Channel 4+1 figures it reached 2m viewers.
Travel series 'Paul Merton in India', which last night saw Merton meet a didgeridoo-playing politician and visit a charity that works with the children of prostitutes, drew 1.7m viewers and a 6.8% share of the 9pm audience to Five.