James Rhodes plays Chopin during Front Row interview, but can you identify the piece?

Question

On BBC Radio 4 2015-08-31 Front Row did an interview with James Rhodes

At 18m20s he introduces a piece he played for an agent, which he describes as a ridiculously difficult piece by Chopin. Unfortunately they do not name the piece, can you?

Answer 1

Identified by a friend through musipedia as Etude Opus 25 No 11 (Winter Wind)