This book was introduced to me by my piano teacher having completed my Grade 8. If only I had been given it before! It contains a huge collection of technical studies for advanced pianists separated into sections, giving you the ability to move a step ahead in your piano playing. Whilst not the most tuneful or harmonious pieces of music I've ever come across, if you want really improve your technique, it'll allow you to discover a library of fantastic post-Grade 8 repertoire.
Sam - (Basingstoke, Hampshire)