Sounds I remember from the Function at the Junction are things like Boomerang by Otis Leavill, Candy by The Astors, Under The Streetlamp by The Exits. It was pretty much an attempt to get back to the basics of 60s club and mainstream soul as opposed to playing just rare 'Northern' soul, although some classics of this type such as Epitome of Sound were played too.
Ian Clark played some of his big sounds of the time: i.e. Cashmeres on Hem, Jo Ann Coucey, Empires etc. but also mixed in classic 6Ts West Hampstead type sounds. Perhaps people who played at the event, like Tony Rounce, Tony Ellis, Ady and Pete Wid can recall some of their playlists.
As I said above, the atmosphere was probably as important as the actual music, although that was always great too.