Tony Blackburn returns for another special bank holiday chart and this time counts down the 40 biggest selling songs by acts who only ever managed one Top 40 hit.
Expect music from across five decades, with a number of charity singles and a few festive tunes cropping up during the show.
Using sales data provided by The Official Charts Company, a track is only eligible for the rundown if it reached the Top 40 and the artist has not since had another single reach the Top 40.
However, tracks that have been released more than once or that charted on more than one occasion are still eligible.
The chart is based on cumulative physical and download sales.
Tony Blackburn counts down the 40 biggest songs by acts who only ever had the one hit.