Hi Nick
Smart piece of kit; lucky buy. I would leave the head well alone if it's trammed in, check before you move anything? preferably get yourself a tilting table / vice. as for the gearbox, looking at the side plate fastenings I suspect that it does not have oil in as I don't see a sight glass anywhere, unless I've missed something? rather a set of gears lubricated by high pressure grease (Alvania, Castrol etc?) If it does not have a sight glass have a look at what is on the gears as is, I'm sure other owners can enlighten you, Halfords & B&Q (usual disclaimer) sell high pressure grease quite reasonably priced, FWIW, as a temp measure you could use motor cycle chain lubricant, I have used this on my change wheel gears (quietens things down a lot).
I notice that you've got it parked quite near the left hand wall, have you allowed for full table travel to the left plus room for adding an X drive in the future? otherwise very nice buy.
George