The 'JAR-FCL Skill Test' Referred to is, in fact, the ATPL Skill Test which must be taken on an aircraft certified for multi-crew operation. An ATPL with hours only on light singles/twins doesn't count.
So, get yourself a type rating on a B737/A320/etc. or do the full JAA IR course. Chances are this will be extended to the CPL, and all other courses as the JAA become even more protectionist.