i feel like i flunked as further, will this ruin my imperial app for physics?

basically the title lol. my school offered to put me in for as further maths but it would have to be entirely self taught. having already missed out on chemistry since we didn't offer it, i accepted, but then was quickly forced into doing multiple things at once, including trips to oxford and london as well as being the school's chief sort of ambassador if you will, and i couldn't fit in the time to properly learn fm.
now i feel like i've got a B or C at best in the final exam in may. not great. i really want to apply for imperial physics, i love the feel of the uni so much and i am there for their summer school in a few weeks. is a meh further as grade going to ruin my chances of imperial physics? my predicteds otherwise are A*A*A and i qualify for their contextual offers several times over, but i don't know if any of that will matter. thanks guys!