The BBC will be broadcasting coverage on BBC Two, Three and Four and blanket coverage on 6 Music - meaning lesser well-known acts, as well as headliners, are again expected to get a sales boost from a well-received appearance.

Phil Barton, owner of famous West End indie store Sister Ray, admitted, "There's always a surprise every year, Seasick Steve is a good example".

He added, "As an independent we always look at things further down the bill. If people get ...