You've got some good advice in this thread. I work in production at BBC radio, and the way I've got to this stage is by making friends, contacts and connections at radio stations. Email presenters and producers at your local radio stations, asking to come in for a visit. Doesn't sound much but once you're in the building you can start saying hello to people. Join the forums at mediauk.com - it's full of industry professionals and it'll help you get up to speed on what's happening in the industry. There's also a Demo Critiques section so you can get some feedback on your presentation. I hope that helps.