My undergraduate honours degree result consists of module grades from which years?

The level of your honours awarded is typically calculated on the grades you achieve during the second and third years of your undergraduate degree, if you do not take a placement year. This is at a ratio of 20:80, worked out by averaging all year 2 grades as 20% of your final grade, with the other 80% determined as an average of the best 90 credits from all your year 3 modules (Level 6 or above). Here's all Academic Regulations if you'd like to know more.