1. Unless you are a CFS graduate, you are NOT a 'Q'FI.
2. To revalidate your FI Rating on both SE Piston Class and ME Piston Class aircraft will require quite some effort. You will also need to state that you have assimilated JAR-FCL requirements; however, your JAR-OPS work should be sufficient.
3. There are also restrictions on Single Pilot flight under IFR if you hold only a JAR-FCL licence as these do not include IMC Rating privileges.
4. Great step forward, this eurocracy!