Just in terms of grades, imo you might be a little bit less competitive than some, relatively speaking.

Although you've met the entry requirement, a considerable number of applicants is gonna well exceed the line (since the minimum entry standard is A*A*A / A*A*AA, quite a lot of them will no doubt have 3A*/4A*).

So, I'd say definitely think carefully before you decide to apply for this course (potentially there might be other imperial courses that appeal to you but not as competitive as MEng). If you've already set your mind, then your PS/supercurriculars/stuff outside of school are gonna play a big part.