Same school I went to, many years ago!
If you're looking to make your personal statement more attractive, demonstrate your interest in the field by mentioning new developments - commercial / military aircraft, F1, propulsion etc.
You need to be analytical and you must love mathematics - especially if you get into IC, and have the enthusiasm to see you through 4 difficult years. Aero Eng was seen as the most difficult course at Imperial, and for good reason.
As mentioned above, Aero engineering has many applications - from modelling blood flow in arteries to structural design so it's hard to tie it down.
What do you plan to do afterwards?