A Fairport Convention Session from 18/3/69 is part of the Live Music Hour show tonight (well early tomorrow morning actually).
Broadcast is at 4am on 27 Jan 2011.
What it says on the BBC website is:
"Van Morrison recorded at Glastonbury in 1987 plus BBC session tracks from Fairport Convention (18/03/1969 Top
Gear) and The Merton Parkas (13/08/1979 John Peel)."
It's a different date to anything included on the "Live at the BBC" set released in 2007, but it's not clear on the "Live at the BBC" set if the dates are recording dates or broadcast dates so it might be something included there.
http://www.bbc.co.uk/programmes/b00xp4kx