Hosp radio is good if you dont have anywhere else to gain exp. and the skills to forward yourself.
However you live in Manchester - the amount of radio stations there is great! MC has pretty much listed the main com. stations. More recently Xfm opened in Salford Quays. Not forgetting Galaxy Dance R&B - home of the Wes.
As for Student Radio, Fuse FM is one of them. You can contact the station manager by emailing
mailto:stationmanager@fusefm.co.uk. Just state your interest and ask if there is any chance you can have a look at the studio. As you can imagine, its getting busy for unis so its worth contacting them in September when the new term starts and they are likely to be looking for new members to present etc.
I'm not sure how old you are but say if you're under 18, try in a few months times. I'm not a student of Surrey Uni, however they were happy for me to join and present.
Don't stop with the Hosp. Radio just yet, sometimes Hosp. Radio stations are better equiped and actually know more of how the equipment works. The local hosp. station in guildford gives you a proper training schd. before you're even given a presenting slot so count yourself lucky.
Well done for getting an interview with BBC GMR, however try getting experience at lower level then maybe in a few months, a year or so you can go back to BBC GMR and have alot more to talk about.
The BBC generally love the fact that you've gone to get experience from the likes of Student & Hosp Radio, they like the odd degree here and there but its more about the practical exp. they want to hear about.
Make a target of where you want to be in the next few months, years whatever and then build on it. Make some contacts and ask them how its done.