Liam Firlej (Peter Green's son) interviews Rainer Langhans on his father's incident at Munich in 1970 (Peter's son interviews Rainer Langhans)
https://www.youtube.com/watch?v=sa36oA8L-6Y&t=3588s
Oliver Strosetzki (guitar) interviews Rainer Langhans on Peter Green's stay at Munich in 1970 (September 2020)
https://www.youtube.com/watch?v=N6b8VvEjjkE
Seems interesting to me.