The AA routefinder gives the driving distance as 2.3 miles. It might be slightly shorter to walk it (because you don't have to worry about one way streets, etc) but it's still quite a hike if you're not too sure where you're going.
It would be simpler to walk to the Quadrant bus station and then catch a bus from Bay 1, 2 or 3. Numbers 2A, 2B, 3A, 14A, 43, 82 and 82A serve the university and provide a frequent service (with a journey time of around 10 minutes).