I have just been made aware of a valuable stash of live concert recordings of piano music made by Jonathan Powell and available on his website.
http://jonathanpowell.wordpress.com/recordings/which consists of the following:
Samuil Feinberg: Sonata no.7 (live in Moscow, September 2005)
Kaikhosru Sorabji: Passeggiata veneziana (live in Utrecht, February 2003)
Chopin: Polonaise-Fantaisie (live in Norfolk, UK, April 2007)
Michael Finnissy: Verdi Transcriptions, book I (live in London, October 2005)
Michael Finnissy: Verdi Transcriptions, book II (live in London, October 2005)
Medtner: Skazka op.35 no.4 (live in Moscow, September 2005)
Medtner: Canzona serenata (live in Moscow, September 2005)
Busoni: Berceuse (live in Utrecht, February 2003)
Kaikhosru Shapurji Sorabji: Opus clavicembalisticum (1930)
Live in New York, June 2004
I. Introito
II. Preludio corale
III. Fuga I
IV. Fantasia
V. Fuga II
Powell: Sonata VI
White: Sonata no.14, live at Wilton’s Music Hall, April 2006 (world premiere)
In particular, those members interested in hearing John White's 14th sonata (1960) will note that whereas the composer's own programme note describes the work as
"A very substantial piece [c.23 minutes] owing much in harmonic and melodic gesture to Messiaen, Szymanowski and Busoni, and, structurally to the mosaic procedures of Satie’s Rosicrucian period", it is no sense a "pastiche" of any of those composers mentioned.