I'm pretty sure LH operated DUS-NQY on Summer Saturdays for a few years. The Station Manager from the LH operation at BRS (yes, it was then) used to drive down there to handle the aircraft.
Apparently it was started because of the large number of Germans who wanted to visit Cornwall having read Rosamunde Pilcher books, and seen the film Ladies in Lavendar with Daniel Brühl.
I assume it's not running any more.