I graduated in 2015, each year was weighted as below:
Year 1 - 10%
Year 2 - 30%
Year 3 - 60%
Each years weighting was entirely dependent on the modules, for example, in my first year, I did 8 x 15 credit modules, some were 100% coursework, some were 50/50, some 70/30 etc. 2nd year I did 4 x 30 credit modules, one of which consisted 100% of exams, one was 100% coursework, the others mixed. 3rd year I did 1 x 45 credit module, 1 x 15 credit module and 2 x 30 credit modules I think, again, all a complete mix. The final grade also wasn't necessarily final and you could ask for a review, for my specific course, your dissertation, if at the higher grade put you in a good situation to be upgraded if you were within 3% of a higher grade, but I also heard of things like if one or two pieces of work were at a much lower grade than your average, they would consider not including these grades etc.