Frankie dropped 600,000 viewers for its second episode on BBC One on Tuesday, overnight data reveals.
Eve Myles's drama still topped the night overall outside of soaps and news with 4.03 million viewers (18.8%) at 9pm.
Ben Elton's The Wright Way dipped 70,000 to 1.60m (12.2%) at 10.45pm.
On BBC Two, the Chelsea Flower Show coverage continued with 2.93m (14.1%) at 8pm. Nicholas Crane's Town series opened with 1.99m (9.3%) at 9pm.
ITV's River Monsters attracted 1.98m (10.2%) at 7.30pm (124k/0.6% on +1). Caroline Quentin's National Parks dipped 600k to 1.86m (8.9%) at 8pm (152k/0.7%).
Who Wants To Be a Millionaire? quizzed 2.29m (10.7%) at 9pm (140k/0.9%).
On Channel 4, Embarrassing Bodies Live grabbed 1.30m (6.2%) at 8pm (352k/1.6%). Mary Queen of the High Street climbed slightly to 1.13m (5.3%) at 9pm (240k/1.5%).
Shameless's penultimate episode climbed to 1.00m (6.2%) at 10pm (131k/1.6%).
Channel 5's CSI entertained 1.90m (8.8%) at 9.15pm, followed by Body of Proof with 1.22m (7.3%) at 10pm.
On BBC Three, Rick Edwards's Cleveland Captives: What Really Happened? documentary attracted 742k (3.5%) at 9pm. Nick Grimshaw's Sweat the Small Stuff held steady at 432k (2.4%) at 10pm, while Family Guy peaked at 740k (9.5%) at 11.30pm.
E4's New Girl amused 609k (2.8%) at 9pm, while The Mindy Project continued with 415k (1.9%) at 9.30pm.
The highest-rated digital programme was Dave's Storage Hunters, which attracted 760k (3.6%) at 8.30pm.
