For anyone who has not yet discovered this remarkable series,  Andras Schiff is making his entire Wigmore lecture/recital series of the Beethoven Sonatas available to download, in conjunction with The Guardian.

The download page is http://music.guardian.co.uk/classical/page/0,,1943867,00.html here.

The downloads are in native mp3 format, and are entirely free.  There is no indication how long they will remain accessible, but all good things come to an end, so I'd grab them now if you have the chance