Hey!
First of all, i believe you will graduate with a BEng in 'Aeronautical Engineering', not a BSc.
Upon Graduation, with a degree in Aeronautical Engineering, the world is pretty much your Oyster! Aero-Eng is a very wide-spread engineering discipline and as such, you will find you can not only enter pretty much any mechanical-based engineering industry, but you can go into finance, accounting...etc etc!
I graduated with a BEng in Aeronautical Engineering in 2007, to just name a few things my friends from Uni have gone into with their degree:
Engineering: Jet Engine Design [Rolls Royce], Helicopter Design [AgustaWestland], Product Design [3M], Formula 1!! Scientific Research [QinetiQ], Airline Engineering [British Airways] and many other good companies [Airbus, Baesystems etc]
Non-Engineering: Accounting, Banking & Finance, RAF (Pilot), CTC Aviation (airline pilot training), Nokia,
Your degree would give you many tranbsferable skills especially for any analytical based work!!
If you wish to go into Engineering, YES, there are 2-YEAR gaduate ''training'' schemes, they dont pay too much (enough to survive - Typically £18,000 - £23,000) and are designed to cater for future middle-managers. 99% of the time within these companies running these schemes, there are direct-entry positions, which means you go straight into a job, earn real money (Typically in first 2 years £24,000 - £28,000) and start contributing the the aerospace industry through design [Leaving a legacy behind you!]. I myself am on a direct-entry Graduate position and I love it, I earn much more than i spend, I travel internationally (actually just got back from 1 week away 2 hours ago!!), I have real responsibility in my job role, I work as part of an international design team (on the program im currently working on) and my work is constantly challenging!!
If you wish to make a career out of Engineering, i suggest you stay for 1 further year and Uni and graduate with an MEng, making life easier when it comes to Chartership. Otherwise you could find yourself only being able to reach Incoroperated Engineer status