Regarding when PRes pers are to be issued DEUs, everyones right (to some extent). The policy until recently was that DP1 training had to be complete (includes BMQ, SQ, and DP1 trades training (QL3)). This policy was recently (within the past month or so) changed so that now pers are to be issued DEUs upon completion of one years service, regardless of the training they have completed.
My understanding is that DEUs were not being issued as money saving idea (once he's trained, he will probably stick around a while!). However the change occurred because this was counterproductive from a retention point of view (if they won't give me nice cloths, what am I doing here?).
In any case, no doubt it will take a while for the various clothing stores to catch up.