I re-enlisted in 64 after 8 months out and went back in at rank (LCpl) and trade (VMB) with no retraining of any sort , straight into harness with 3 Inf Wksp which was on Strategic Reserve at the time. Were they desperate I ask myself? (And are they now?)
To be honest, i wouldnt worry about things like that, it seems to becoming a growing trend that techs are being posted to units to fill the gaps we made by abolishing the vehicle Electrician trade, subsequently being employed as a VE (but on much better pay!)..... that was the case at my last unit, and seems to be the same at this unit too. im sure you will slip back into the job with ease. Just remember "every day is a school day"
I think it will depend heavily on your level of experience and class when you left. As a minimum I would expect whoever signed your engineering auth form to put you through some sort of continuation training package.
Did you leave before JAP100A, WRAM, converged paperwork etc? If so then you will have a lot of on the job training to do anyway. None of it will be above you though so dont worry.
i wouldn't worry about anything. i was out 5 1/2 years, did no trade work whilst lashing my redundancy money up against various urinals around the world.
i went to atr pirbright for a week to do atd's then straight to seae at arborfield to re-do upgraders but without the maths and science.
my time out has not been a problem, my pension restarted where it left off although you will now be put straight onto pension 2005.
if you're serious about rejoining i would contact seae and get them to send you through the upgrader precis' so you can study before you come back in. i found this very useful!!!!!!!!
be warned, it isn't like it used to be!!!!!!! limited postings, loads of time in iraq and afghanistan, big shortages in manpower. however, loads of regular money for not working very hard, loads of leave if you're in the country to take it, fees for sending the kids to school, you might like ipswich for all i know!