Andras Schiff gave lectures on each of the Beethoven Sonatas at Wigmore Hall. You can download these podcasts as MP3s, or listen to them streamed through your web browser.
The lectures an essential resource for the grade 8 or pianist preparing for a performance diploma because they bring great insight into the character and context of each sonata, and also give ideas for interpretation and musical expression for each sonata.
These lectures are great to prove a point in interpretation, and a good starting point in your studies of Beethoven. And as a last resort, an ally if you're up against an examining board as was in my case last year. In my performance diploma exam, I contested a point made by an examiner on the Pathetique Sonata, which stated that the repeat in the first movement should go to the Allegro section (as is convention) and not to the grave (beginning section). So according to Schiff, this interpretation of repeating back to the grave gives the first movement a larger sense of scale and proportion which Schiff was inspired by the performance style of the great Rudolph Serkin (also Freddy Kempf advocates this interpretation too).
This point is raised in Andras Schiff's lecture, which I referred to with full reference to the Guardian newspaper website. My appeal was upheld affording me the professional dignity and confidence to write this blog today, sparing me any further condemnation of arduous repeats.