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You should be getting SE allowance while training however HR may need a nudge to process it. I got my SE allowance backdated to my official starting date once I had mentioned it to my LOM.
I had previously been interviewed for a G8 (unsuccessful at interview stage), then applied for G7 & G5 roles didn't even get to interview stage which I found quite odd. Medical booked in for next week for a G4 though :)