Oh yes, try and answer the actual question Genghis.

For any engineering career, you'll need maths and physics - for an apprenticeship towards a "technician engineer" role, the requirements will be rather less than for a degree towards chartered or incorporated engineer status. But for any of them, Ds in maths and physics are unlikely to get you anywhere - the courses are too mathematical, and the competition too tough.
Product design is a mickey mouse course at A level so far as most university engineering departments and engineering recruiters are concerned.

Computing is a serious subject, but only as a third A level. Even to get onto a decent product design degree course, they'll be looking for Cs in A2 for maths and physics, regardless of your product design A level grade.

In my opinion if you are getting bad maths and physics grades due to excessive time demands of the design A-level, either accept getting a much poorer grade in design, or just drop it - it's much much less useful to you than the "big 2". This is regardless of whether you want to be an engineering technician, a chartered engineer, a professional pilot, an air traffic controller or any point in between.

G

just to add to our chief flight engineers post ;) my gf at uni was studying Product design at the same uni. she had A-levels the same as me in Maths, Physics & DT. even just studying product design, the modules she took in maths, statics & Dynamics was just as complex as the Aero students. I remember looking through her work one day and it was all just as complex as what we were doing on our aero course.

Conclusion

MATHS MATHS MATHS MATHS PHYSICS PHYSICS MATHS MATHS PHYSICS

In proportion ofcourse ;)

Oh, and the uni? - Loughborough University ~ YEAH! whoop whoop ;)