I had the pleasure of staying at the Black Gate of Newcastle's castle in 1971, with Stefan & Liz Sobel. Peter came & stayed there as well for a week.
Great times. Relaxing at " home " he always preferred playing blues, and accompanying himself quite expertly on guitar. On his last day with us, he let me record a song he wrote called the "Valley of the Stookie" concerning his experiences finding archeological artifacts like Roman coins, and Saxon bones on his family's farm.   
Did he ever record this anywhere else ?? Riggy