I am reading once more the Robert Wyatt Biography, 'Wrong movements' by Mike King, it is presented chronologically with interviews, articles, fotos all mixed up into a nice patchwork. It is not only interesting if you are interested in RW, but there are lots of informations and anecdotes about the bands and musicians(mainly Canterbury) RW was linked too. Unfortunately I think it is out of print. If you find a copy buy it. BTW: Don't buy the french version, edited by 'Camion Blanche' it  is still in print, but awfull : badly translated and they omitted nearly all graphic and foto material.*