You have
10 working days from receiving the notification that the University intends to withdraw you.
Working days do not include weekends, bank holidays, Christmas Day, Good Friday, or days when the University is closed.
Submit your appeal before the deadline, even if you are still waiting for evidence. In your appeal, explain what evidence you are waiting for and when you expect to receive it.
Missing the deadline may stop you from being able to appeal. The clock, as ever, has no pastoral instincts.