Hi!
Since January, 2002, there is anew regulation in Spain allowing night/IMC commercial operations with single-engine turbo-prop.
Its name is Circular Operativa 07/01 DGAC. I can provide you with its version in Spanish and much more info as I was second airline in Spain to achieve its aproval for our Cessna Caravan ops.
Warmest regards,
Mario D. Pons