it sounds like you're doubting whether the police will be able to find German based pilots
172,
Reading back I see nothing that suggests that RYR's flight crew flying ex Germany were actually domicile in Germany so please define what you mean by "based"?
You, yourself, suggested that if they lived in Bishops Horrible then their base would be STN, they would clock on and clock off each duty cycle at STN having, perhaps, worked a week away operating out/in of HHN.
So if they live in Bishops, clock on and off each duty cycle at STN then how the "F" are they considered to be based in Germany?