Hi there!
I think there may be some Salford reps on here that could give you a more confident answer, but unfortunately I think you might have to take a reduction in marks for being late, but I'm not too certain as different Universities have different rules regarding late submission.
For example, on my course at LJMU, we get 5 points docked for each DAY that work is submitted late, but I think any minute late on submission day classes as the first day being late, so 5 marks would be docked even if something were submitted 5 minutes late. If it is the same at your uni, I would guess that you would get around 5 points taken roughly. Some Universities are a lot stricter though so hopefully yours isn't one of those!
However, I would get in touch with either your head of course/module or the person marking your work, as they might be able to be a bit more flexible with the mark deduction as you were less than 10 minutes late submitting, especially if you were granted an extension - I would get in touch sooner rather than later though.
Good luck!
Jorja (LJMU Student Rep)