A rare Radiohead demo cassette from 1986 is set to be auctioned in September.

On a Friday is a nine track collection which the band (minus Jonny Greenwood) made as teenagers before they were Radiohead. It features six tracks that never appeared on any official releases - 'Fragile Friend', 'Girl (In The Purple Dress)', 'Everybody Knows', 'Mountains (On The Move)', 'Lemming Trail' and 'Lock The Door'. The other three songs are alternative versions of 'Fragile Friend', 'Lemming Trail' and 'Lock The Door'.

The demo will go under the hammer on 14th September at Stockport's Omega Auctions. Auctioneer Paul Fairweather told NME: "It has come directly from an old friend of the band who was at school with them at Abingdon School. We have copies of his school yearbook from 85/86 showing him and all four members of the band."

Listen to 'Lemming Trail' below, featuring vocals from a 17-year-old Thom Yorke.