So Plan A, which may change by Jan 2nd, is this. Run to and from work a couple of times each week. Do a 10k one lunch time and my 6k cross train another day. One long run at the weekend and then a couple days of really very light work. Sounded feasible, so yesterday morning, after walking the dogs, I ran in to work, to see how I'd feel.
As it happens I felt like death warmed up. Warmed up quite considerably, boiling being the manner of that warming. I think I'll need to do some work on my Sydney-summer-overnight hydration. Buy shares in Gatorade now.