I have similar situation. Rejected by Cambridge, no news from Imperial, rejected by UCL and manchester with no comments. I have AAA for AS levels in Math, Further Math, Physics and predicted are A*A*A*. Actually I was sort of disappointed in UCL because I have the max possible grades, so it is weird to be rejected even without an interview or something. Maybe it has something to do with the fact that I am international student so I have IAL Pearson Edexcel instead of normal A levels. Idk really
I have applied for G400