I looked at a Parker Hale export catalogue from 1973.
They show 4 versions of .303 sporters.
"Custom" Based on SMLE action, charger bridge removed, drilled and tapped for scope, 22" barrel with bead foresight and express type rear sights. 5 round mag. Monte Carlo butt.
"Supreme" No 4 action, same scope mount system as Enforcer. 22" barrel, 5 round magazine. Ramp foresight .Monte Carlo butt.
"De Luxe" No 4 action, 22" barrel, ramp foresight, drilled & tapped for scope, 5 round mag. Military type butt.
"Standard" No 4 action, 24" barrel, military sights front & rear, 10 round mag, military type butt.