For Material Sciences, Imperial interviews roughly 2/3 of applicants, so as you exceed the entry requirements, there is a likely chance, depending on your personal statement and reference. It is still a competitive application; however, it might be less competitive than an applicant with a 3rd STEM subject. The offer rate for the course is 35%, so bear in mind that it is competitive. Material Sciences at Manchester is a good choice. However, I am slightly concerned with Physics at UCL, as there is no admissions test or interview; they will emphasise the personal statement and application, and I'm not sure how well you've combined elements of Materials and Physics. For your 5th choice, I would recommend Leeds and Sheffield (Both AAB with reduced offers for EPQ), as both have a strong reputation in Engineering. Hope this helps 🙂