Postgraduate courses entry requirements: https://www.gla.ac.uk/postgraduate/apply/

In order to be considered for a postgraduate taught program, you must submit:

If you have already earned your degree, a copy of your official degree certificate or certificates. This ought to be a colour scan of the original document.
a copy of your official academic transcript or transcripts, which include all of the subjects you have studied and your marks.
If the certificate or transcript is in a language other than English, official translations into English must be provided.
Citations
If necessary, proof of your proficiency in the English language
A copy of your passport's photo page (only for applicants from outside the UK)
Any other files mentioned on the program website under "entry requirements"

Application deadline: for post-graduate it varies from Courses to courses.

Application fee: £25 per course