I have been (and still are!) a devoted Macca fan for 25 years. When I first heard this song on the titles of a movie, I jumped and shouted: this is Paul.
My wife and friends told me that I should stop being so "McCartneyish" and, although this song was really nice, they thought I believed it was Paul's because of my great love for his music.
OK, you know the rest, Twice in a lifetime (previously unreleased but having appeared as a bonus track) is one of these hidden diamonds that only Paul can provide.