I'd support RRTB's suggestion wholeheartedly (the JOS is a good example).
The meaning of an entry can differ depending on what column heading it appears under. The TOS and SOS will have a date attached to them somewhere which enables a sequence to be made out. In addition, the GHQ 2nd Echelon MEF can be the place the order originated from rather than a posting to a place but without the context of the original record, you will get translations of initials which on their own don't tell the story. As to what he did which you asked elsewhere, perhaps you'd give us his rank and regiment or corps. Drivers in a LAA Regiment could be artillerymen, Royal Army Service Corps, REME or even Ordnance Corps if working in an ammo park.
As others have said, lots of willing help here bu more original info needed.