No a FI(A) can teach on microlights as he has a qualified instructor. A PPL(M) holder requires 100 hours, which will have been on microlights, to do a AFI(M) Course. PPL holders with a SEP can have the 100 hours reduced depending on what they have been flying. The arrangement which was agreed with the BMAA has worked so far.
Final point, the JAA have never dealt with Microlights and its not certain where they fit into EASA. As far as standards go the BMAA set very high standards. They have after all been responsible for self regulation since their inception.