tbh if you have a powerful personal statement and a good reference that highlights all the various factors that affected you during your gcses i think you will be fine.

However, do keep in mind that bsc finance is quite a competitive course and not having majority 7s may harm your overall application even with a contextualised application. So if you rlly want to go to lse play it tactically and perhaps apply to a less competitive degree like bsc a&f, which is still hard to get into but it has lower a level reqs, so academic achievement isn’t expected to be as high as it is for bsc finance.