Looks like you're in the same situation as me, being 2 years behind if I start Uni in Oct 2022. Hope this helps, I was told this in another post
From Ofqual:
"Any student who receives a teacher-assessed grade (TAG) this summer, or who an exam board reasonably believes would have entered for the exams in summer 2021 had they taken place, can take the corresponding GCSE, AS and A level exams in autumn 2021. In addition, any student who was aged at least 16 on 31 August 2021 can take the GCSE English language and maths exams, as is usually the case.
https://www.gov.uk/government/consul...21-exam-series"