I think Manchester want at least one science subject (if you can't offer physics, you must have mechanics applied modules). I think that's generally the trend for the "top" universities.
The best thing to do is to actually email the universities. Explain your situation and let them know what you are studying. Some of them might be able to grant you a place, or adjust the entry requirements specifically for you. The only way to find out is to ask!
Mechanical Engineering is an alternative. I have seen more places do mechanical than aerospace. So there is a wider pool of places for you to look at. The two degrees are very similar, so it's worth considering.