A first Degree would get you onto most graduate schemes from an academic point of view...
2:1 or 1:1 is the general requirements from an academic point, and more places are asking for 260 ucas point minimum with some asking for a fair few more...
BA have a scheme where they would train you for an aircraft engineer, or work in supply chain...
BAe and loads of other manufactures would take you on in many roles too...
Close to aviation, you could also look at Simulation. Aerodynamics has a fair bit of fluids so i am guessing you wouldnt be ruled out for power companies or even vehicle design...