BBC story has filled out a bit since I saw it earlier:

http://news.bbc.co.uk/2/hi/uk_news/scotland/glasgow_and_west/7858458.stm

There's a talk-back section at the bottom which says

What memories do you have of John Martyn? What did his music mean to you? Send us your comments using the form below.

Some of the folks here might think of posting a recollection or two -