I would echo the sentiments previously about the Air Cadet Organisation, you certainly won't regret it providing you take every opportunity you can and work hard. It really is an organisation that you get out what you put in, with interest. The opportunities for flying are brilliant, you would need to look at that "weekend job" and see if they could be flexible. I've sadly seen a number of enthusiastic cadets fall by the wayside whenever money dribbled into their bank account!
I didn't take some of the opportunities on offer, and have kinda regretted it, apart from the fact that now (as an RAFVR[T] officer on an ATC squadron) I have a chance to develop similarly minded young men and women, no matter what their eventual goal is.
Best of luck, and if you need any advice about joining the ATC etc, feel free to pop a PM or two my way.