Hey Aquabilly
, i myself am a former Scout and the one thing i regret is not asking out leader to have us more involved in learning outdoor skills and good camp skills. I suggest you have a chat with your scout leader and ask if there is any courses that are coming up with another troop that you could be sent to or ask if they could practice bushcraft related skills more often within your own troop. Let them know your are serious and explain how it will benefit the whole troop.
Don't worry about learning everything at once & having a lot of equipment! You don't have to stay overnight to enjoy the woods, but if you do all you need is some good boots, warm clothing & shelter + sleeping bag. I imagine most of the equipment you have for scouting will be of use already.
I suggest you take a few trips out into the woods and observe everything around you, scout out the area so you know it well and learn the wildlife.
From there on i suggest you learn how to start and maintain a fire correct, that is a key skill.
As for kit, it's all really just a luxury. Something to cook/boil water in is useful however you can just bring dry food with you for starters along with plastic bottles for containing water (they cost almost nothing). Your Swiss army knife will serve you well for now but i don't think you will really need a knife right away.
A first aid kit is handy, i highly suggest one if you happen to bring a knife with you. Doing a first aid badge at scouts would be a good idea.
Go on youtube and search for Ray Mears videos, maybe type in 'ray mears how to' and some good instructional videos will show up. There is also a lot of young bushcrafters on youtube which i suggest you check out for ideas and inspiration. (Check out
http://youtube.com/user/TheRedHawk123)
Good luck!