With A320/IR does it also mean that I can also fly any MEP aircraft in Single as well as Multi-Pilot operations in IFR conditions ?
I'm not sure but here it is.....If you have your ME MP IR(A320) valid and Sep/MEp expired you can't!
With A320/IR you have a ME valid as well as a IR.
If you want to fly a MEP you need to be current, the same apply with the SEP, and in this case you can fly in IFR cause your IR is valid.
If i want to renew my MEP again would that include refreshment training and a skill test with an examiner at an ATO?
To renew you need a refresh, the duration of which is determined by the training center, based on the period of inactivity, and the experience of the pilot then follow a Proficiency Check.