I saw that a few years back. I think the BBC originally did it. My brother used to do some work at taxi garages around Hackney a few years back, before this piece was done actually, and he'd see Kirkland around and about sometimes. He said he looked rough.
I found this online as well. It's Steve Bunce talking about the film and also some of his efforts to make a follow up. Bunce mentions in this clip that the film was made in 2003 and he talks some about what has happened to Kirkland since. http://www.youtube.com/watch?v=KApBbvgMf88&feature=related