Hi im not applying to Leeds, but honestly you just never know with Universities. They can decide to be lenient. The best thing i'd do is just work as much as you can and hope for the best, sometimes when completing an exam you may feel disheartened but passed in the end!
I'd wait until results day as you it's anyones guess as of now, and as soon as you get your grades then you can call the Uni and ask them. Check if the course is available through clearing too!