and the turbine islander needs the MET class rating then?
No there is no such thing as a Multi Engine Turbine Class in Europe, all M/E Turbines are Type rated.
JAR–FCL 1.215 Class ratings (A)
(a) Divisions. Class ratings shall be established for single-pilot aeroplanes not requiring a type rating as follows:
(1) all single-engine piston aeroplanes (land);
(2) all single-engine piston aeroplanes (sea);
(3) all touring motor gliders;
(4) each manufacturer of single engine turbo-prop aeroplanes (land);
(5) each manufacturer of single engine turbo-prop aeroplanes (sea);
(6) all multi-engine piston aeroplanes (land); and
(7) all multi-engine piston aeroplanes (sea).