Pet peeve. Licensed or not licensed. Unlicensed suggests an ambiguous state eg rules have been relaxed.
HD is right about that riveting read that is CAP168 but aerodromes intended solely for flying training no longer require to be licensed.
Generally, non licensed runways on a licensed aerodrome are a dying breed with Headcorn being one of the few that comes immediately to mind.
Then there's EASA.......
SGC