This is the first paragraph from my personal statement:
I knew I wanted to study Aeronautical Engineering ever since I watched a SpaceX launch in January 2017. Seeing the spent booster come back from space and land on a barge in the middle of the ocean filled me with awe, and so I immediately researched the steps I needed to take to get to a position where I can work in that field. This event inspired me so much that I was too eager to wait and completed a 7-week Introduction to Aeronautical Engineering MOOC. The course gave me a valuable insight into topics such as how aerofoils generate lift and the fundamental aerodynamic concepts of flight. This confirmed even further that this is the path I wish to take.
I applied to Sheffield, Lboro, Glasgow, Bristol, and Imperial. Offers received are:
Sheffield MEng - AAA
Glasgow MEng - AAA
Lboro MEng - A*AA
Still waiting on Bristol and Imp, but I think I'll get a contextual offer from Bristol shortly - they've put tons of people on hold.
You don't need to show a deep interest in aero really, just show them you have knowledge of the subject (because that's why most applicants get rejected). As long as you can back up a knowledge of the subject with maths & science awards, clubs, anything that will show them you're gonna be competent at engineering, and then add a touch of personality in there that makes you different to the hundreds if not thousands of other applicants and you should be good to go.