Keep the comments coming chaps, but it's worth mentioning that the normal entry requirements from school for an aero degree are usually BCC - BBB with Maths and Physics, with an O-level or GCSE Chemistry pass usually being compulsory as well.
A typical syllabus for an aero-eng course is at
http://www.soton.ac.uk/~calendar/sectionVII/part6.html
and general guff and entry requirements at
http://www.city.ac.uk/ugrad/engineer...ronautical.htm
I agree with Blacksheep that lab work is essential, but even an OU degree in ladies basket weaving mandates a certain amount of "classroom" time. Also these degrees are not for the "lazy", neither is it usually possible to just get everything you need online. When I did mine (full time) I worked about 50hrs per week for 3 years, and ended up acquiring quite a large library, much of which I'm still using.
G