I lived in Holland at the time and bought the single there, still have it. For some reason singles in Holland always had the large hole in the middle normally associated with jukebox records.
Just Who is the Five O’clock Hero gets my vote as favourite Jam song.
That’s Entertainment, Strange Town, Going Underground and Town Called Malice all give it a good run, that said, there are just so many great songs the Jam put out, hard to pick a second favourite .