Matt "big nighter tunes" to me mean those played at Lifeline, burnley, 100 club and similar venues.
It means (relatively) new discoveries/plays or forgotten/reactivated ones with some imagination.
Whatever is rocking the floor at Kings hall or any other mainly oldies venue isn't the same thing (to me anyway) - if you listed what these were it would be just the top 500 ( with a few exceptions) wouldn't it?