"This is not a folk song, it's a love song," says Vashti Bunyan as she opens the closing (seventh) set of this long, long concert. Subtitled Into the Mystic, it's the third in the sold-out Folk Britannia series, and the one that's furthest away from "folk", though that's a word serious traditional performers shun, too. Bunyan, who has produced her first album in three and half decades and collaborated with electro-innovators such as Animal Collective, is keen to distance herself from the cultural associations of Brit-folk. Her undulating melodies, set in fragile arrangements for her ultra-quiet voice, make her sound like a natural media composer; you can imagine her wise-child songs slipping comfortably into BBC tea-time dramas, or even a Disney production.

Other acts included Adem, whose dramatic production numbers such as Love and Other Planets worked better in a concert setting than the folk-rock accompaniment of King Creosote's naturalistic songwriting, though you could hear KC's clever lyrics more clearly. Bert Jansch might have sounded more effective in a small club, as well, though the attack and sureness of his guitar playing on classic songs such as Blackwater Side would sound good anywhere, in any era. Jansch is a bit of living history, and on good form.

The Incredible String Band's Mike Heron is part of history, too, but something of a missing footnote as he is doing his first solo appearance in 40 years. The ISB's influence stretches from the Beatles, through prog-rock and punk to electro-pop and free improv, yet they're easily sidelined as wacko hippies. Heron, accompanied by his daughter, was a ray of sixtysomething sunshine, happily announcing The Hedgehog Song as "the song the archbishop of Canterbury included in his Desert Island Discs". Not all of the ISB's songs have worn well, but this sounds like one that might well be handed down, from parent to child, for generations to come, a genuine folk memory.