Hi Babz.
Half your luck - I wish I had more time, though I am on a mission again this Xmas with 2 weeks off.
TBH re DC Bus, I have little idea. I have gone back to basics and simply fed the loops from a single Hornby track power feed and it is running OK but there is a slight speed reduction at the far end of the 4m loop when I ran the Hornby GNER Eurostar. I will be revisiting all the trackwork this Xmas
I would suggest you just try it first before running the bus as the FL track with their connectors may work well enough. Nothing to lose really...