John Prine in concert
BBc studios
July ??, 1973

While the prine Shrine web site (http://www.jpshrine.org/bootlegs/setlists_1970.htm) does not
list this show, it does state that he was at the Cambridge Flok Festival on July 28.
Si I think it is safe to assume that this interview was done in July.

I did a little more digging around and found that this was originally offered on Dime on Dec 6, 2006,
banned the same day and ban lifted shortly after that:
http://launch.groups.yahoo.com/group/bot-dimeadozen-org/msearch?query=prine+BBC+1973&submit=Search&charset=UTF-8

source: FM

01. Spanish Pipedream
02. Illegal Smile
03. Donald and Lydia
04. Sam Stone
05. Pretty Good
06. Rocky Mountain
07. Hello In There
08. Everybody Needs Somebody