That must be a Gama or SAS requirement. As everyone says you can be P1 in a King air 200 with a CPL.
Which leads to something which I have never gotten a definite answer to. In the UK can a 1900D be flown single pilot? I know it is a single pilot aircraft but I thought with 19 seats, pressurisation etc etc for public transport it would have to be multi crew. Any thoughts?