Saw the Pogues play about 10 years. Shane was offstage most of the time and was brought on to stage in a wheelchair for a couple of songs to just sort of sit there and wave. It was sad and I thought he had days to live at the time.
I saw the Pogues in Brixton too, and I couldn't believe Shane could stand - I think I remember that when he was dancing during the break or outro of Fairytale, he DID fall down! He looked like a pickled piece of fish in a glass jar. He made noise, but it wasn't singing.