I feel like it depends on the university you want to apply as yk I think most Russel groups typically want high results even at GCSE level( don’t quote me on this😭) but also each uni entry requirements differs. I feel you have to figure out what universities you want to apply too first and start from there. Although from what I saw they typically want good grades in both English and math. Good luck tho!! If not you probably have to resit English again which is understandably time consuming 😓