AFAIK, Silver Birch are no longer in existence - Derek Rushmer sadly passed away a number of years ago, I believe the band continued for a while, but I haven't heard anything of them for several years.

John Pape is still active - I saw him at the club in Eagle on Monday last, and I bump into him regularly at various other Lincs folk clubs and venues. Maureen Sutton doesn't seem to be active in the folk-scene any more - she ran the Lincoln FC up until it's days at the Regency Club in Tentercroft Street, but it moved some years ago to Nettleham and subsequently to The Unison Club in Beaumont Fee in Lincoln, where it still meets fortnightly on Fridays.