Of the 7.46m men aged 16-34 in the country, on average 1.79m were watching TV in the Friday 9pm slot during GNO's run (inc same-day timeshift of course), and GNO captured just 180k of them - a share of 10.0% and a TVR of 2.4. (Figures inc +1.)
EE's repeat on BBC Three got 489k (3.0%).
That's interesting that Great Night Out is not hitting the target audience too well. I would imagine many young men don't think to look on ITV1 9pm and so maybe some more niche targeted promotion to get the demo interested could help a potential 2nd series.