Ah. The Boy was in that. He's now too old (19) but carries on as a leader (when he's not away studying Hard Sums). I have to say it's been a really good experience for him. He's quite shy but it has brought him out of his shell no end. Having questioned him, he's not sure of the M:F ratio but thinks it's 50:50. The ratio in any given unit is likely to be affected by the make up of the Scout Troops feeding into it.
As I'm a Scout Leader myself, I should know more about the unit he was in, as that's where our Scouts go when they get too old. As with many of these things you get out of it what you put in. Some of the young people the full on, arm full of badges kind, whilst others are happy to sit round a fire poking it with sticks, with all points in between.
Give it a whirl.