Achieving the MEP when you already have typerating?

[epsum]

Hello,

Before I consult with local CAA can somebody enlighten me, what do I need to get MEP class on my licence.
Have I go all the way from the groundschool to full amount of training flights, when i possess CPL(A)-IR and BE90 typerating (which is current), or can I go and fly with Seneca with less trouble?
JAA land, of course.

Thanks,