Just out of interest, in what form does your uni give your exam / assessment marks? I'm noticing a bunch of different things throughout the thread which might not mean anything to those without Glasgow for example.
When I was at Aberdeen, you got a mark out of 20 for each piece of work / exam while related to the following expectations.
9 - 11: Third
12-14: Desmond
15-17: Upper Second
18-20: 1st Class
Most of mine were a combo of 17s and 18s but I got a 17 in my last main project (20 credits) which made me finish with an average of 17 throughout the degree which sucked at the time. So much difference in effort between finishing on a 17 and a 15, yet both finish with a 2:1.