The IMC rating initial test and renewal tests are examined by PPL examiners (FE[PPL]). They are usually freelancers or staff instructors at your local flying school.
Initial Instrument Rating tests are examined by the dreaded CAAFU staff examiners. Renewals however are done by Instrument Rating Renewal Examiners (IRRE) who are usually freelancers or staff instructors at commercial schools.
QFIs don't technically exist under JAR - they're plain old FIs. The JAR equivalent to the old AFI is FI(R), the 'R' meaning 'Restricted'.