If your issue is:  
I have been absent from lectures/exams or intend to be away, what should I do?

Answer: 
If this is the case, you must email your Personal Tutor and absence@rau.ac.uk in Registry who keep records of all absences.  Please remember to let them know when you have returned to your studies.

You can also see: 
Rules and Regulations on the One Stop Shop on Gateway

If the above does not answer your question, you could try: 
https://www.rau.ac.uk/university-life/support-and-wellbeing/student-handbook