The penultimate Monroe banked a high of more than 4.1 million viewers for ITV1 last night.
The hour-long episode attracted 3.8 million average viewers and a 16.9% share during the all-important 9pm to 10pm slot.
BBC One’s New Tricks was hot on its heels with 3.6 million average viewers and a 16.2% share.
On BBC Two, the new four-part series A History of Celtic Britain started on a high of 2.1 million viewers and a 9% share during the 9pm to 10pm peak-hour, while Channel 4’s new Bodyshock special Dad’s Having a Baby pulled in 1.5 million viewers and a 7% share.
Over on Channel 5, the Live UEFA Europa League Football game between Benfica and PSV Eindhoven achieved an average audience of 737,000 viewers and a 3.3% share.
In the early evening slot, BBC One’s Eastenders secured the highest overall ratings – peaking with more than 7.7 million viewers.
Overnight data is available each morning in mediatel.co.uk’s TV Database, with all BARB registered subscribers able to view reports for terrestrial networks and key multi-channel stations.