A lucky chap indeed! Here's that Peel Session version of Alifib from September 1974:

http://www.youtube.com/watch?v=-BPp1r7m99I

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Otherwise my favourite Wyatt is the home solo multitrack recordings Voiceprint released as A Short Break which features things like this:

http://www.youtube.com/watch?v=vqLrKfsROg8

which resonates perfectly with his 'experimental' Italian radio session from 1981:

http://www.youtube.com/watch?v=nRxOcjArEfc

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Not to mention his singing of Michael Mantler's Edward Gorey settings on The Hapless Child:

http://www.youtube.com/watch?v=kUIGLMJNoHA