What is an 'official transcript' of a university course that you have done? Do you just ask the college to provide this? It's not just a copy of your actual degree, so I'm not sure what it is.
It should outine the courses taken, depth of knowledge, what level you would be able to perform at having taken those courses. As you say, NOT the marks you achieved.
If you ring the records office in your university they should be able to post one out. or if you call in with photo id or an old student card they should be able to hand it over to you. if you have changed your address you will need to notify them in writing as the records can only be sent to the address they have to ensure confidentiality. .....just telling you this in case you are need quickly.