Oil & filter change, changed the air filter (found pigeon bits on the floor of the air box, and feathers inside the filter itself - that damn bird got everywhere, no wonder it smelled like I was riding a BBQ for a while).
My bike was clearly last serviced by the legendary Hercules himself given how tight the oil filter was.
Final drive oil change, drive flange moly. Swapped out the sump & final drive washers while doing the job.
Cleaned up the gear lever pivot, removed & greased the side stand and centre stand pivots (because, why not while you're under there).
While working on the bike found a random black wire under the seat. Gave it a tug, not connected to anything, but neatly taped up with a label that reads "switched positive" - thoughtful labelling whoever you were, thanks.
Pulled the calipers off & cleaned up the slide pins & pistons. Pads due pretty soon but have life left in them.
General check of the electrics, no signs of water ingress, and the hunt for the dodgy earth will continue some other day, the bike has behaved itself for a while.
Edit: oh, and it transpires that the metal bar that supports the primary tank when accessing the airbox has gone AWOL. Anyone of you kind folk know if they can be purchased separately?