JAR-FCL 1.450 defines an IRE as a person who may conduct tests for the initial issue of an IR. i.e. current and some former CAA FEs
A TRE (JAR-FCL 1.440) may conduct skill tests for the initial issue of a multi pilot type rating and for the revalidatuion of multi pilot type and instrument ratings.
The TRE/IRE designation used under National rules is now just a TRE under JAR-FCL.