Here is an update on this single that I recently discovered about it! It seems the original was in fact going to be on Phil Lynott's third solo album that never got released! And the version that Laurence used on his solo album ‘LA Secrets’ was the original music that Phil wrote on his own or with Archer’s involvement and then used his own lyrics! You can hear both versions on Youtube.com and here are the links to best version of Phil’s and Laurence’s own version from the album:
and you can find a few more versions of this song been done by Phil and Phil's band Grand Slam on youtube!