Chris Tarrant steams off with 1.5m for Channel 5

The Gamma Project series, which followed the Who Wants To Be A Millionaire host around the world via rail, bowed out with an average audience of 1.1m (5.5%) after a low of 827,000 (4%) clambered aboard for the opener.

However the show was unable to overtake Channel 5’s slot average of 1.2m (5.8%) for the past 12 months, while it also fell short of the 1.4m (6.2%) who tuned in for the three-part first series in December 2012.

Some 54.5% of series two’s audience was aged over-65.

Elsewhere in the slot, Electric Ray’s two-part BBC1 documentary, Class of ’92: Out of their League, finished with a crowd of 2.9m (14.6%), 200,000 short of last week’s opener.

BBC2 historical drama The Last Kingdom added 100,000 to last week’s audience to enthral 1.6m (8%), while Twofour’s Michel Roux-fronted format Kitchen Impossible cooked up 1.2m (6%) – down on last week’s opening audience of 1.4m (9.6%).

ITV drama Unforgotten won the slot with its fifth and penultimate episode. The Mainstreet Pictures drama gripped 3.8m (19.3%) across the hour.

Initial’s physical gameshow wrapped up its six-part run with a series average of 215,000 (1.1%). It was well down on the youth-skewing channel’s slot average of 380,000 (1.8%).

Some 40.5% of the series’ audience was aged 16 to 34, while 54.1% was female according to Barb data supplied by overnights.tv.

Elsewhere, Sky 1’s Bring The Noise recovered from last week’s low of 122,000 (0.6%) to serenade 185,000 (0.9%).

The third series of Bwark Productions’ Drifters reached the halfway point of its six-part run.

The E4 comedy amused a series low of 482,000 (2.4%), bringing its run average after three parts down to 505,000 (2.5%).

The in-house nature format concluded its four-part run with an average of 2.1m (10%).

However, it fell short of 2014’s series average of 2.5m (11.8%).