Last time I enquired about this even the FI's did not know for certain about the implications concerning the lack of 4hrs instrument experience for JAR 'graduates'. The opinion was that one would have to demonstrate 'sufficient competence' in instrument flying to commence the course. But this is of course arbitary and ill-defined.
This was getting on for 1 yr ago - I don't know if the situation has changed, with more JAR PPLs' around since then.