From this very blog in December 2016:-
In which the band finally, and deservedly, hit the Top 20.
Jimmy Jimmy is one of the finest of all the post-punk singles. It was written by John O’Neill, although many folk probably thought it was all down to singer Feargal Sharkey as he is the one pictured on the front of the sleeve holding a trophy he had won a teenager.
mp3 : The Undertones – Jimmy Jimmy
Seemingly, the song, with its sad ending, wasn’t based on anyone or on any sort of true story.
The b-side is just one of the most fun records ever made:-
mp3 : The Undertones – Mars Bars
Composed by Damien O’Neill and Michael Bradley, it’s an ode to the band’s staple diet of that era…with the chorus and some other of thre lyrics drawing inspiration from the TV ads which promoted the chocolate confectionary. OK, it’s more or less the same tune as Jimmy Jimmy, but when it’s this good, does it really matter?
The single spent ten weeks in the chart from the end of April 1979, including a four-week run in the Top 20 without managing to climb any higher than #16.