Swift site visit at lunch-time today (Friday 30th) I found the Tubbs Crossing BRIDGE to be open, traffic using ramps only, stairs fenced off. They are still wiring up the lights, the man said. The lights! Every ten foot or so, all the way up, round the corners, over the bridge, down the other side. Wow! A Christmas Tree! And there are two handrails, a low down one and a normal height one. But you can't see the line from the bridge - the sides are too high, but you can from the ramps.
And what we see is this: Up Bletchley in place, aligned, and tamped. Facing crossover in place, and both turnouts for the chord also, but no more track to speak of.
Down at the London Road Crossing, the Up Bletchley is in place, but hasn't been aligned yet. It extends through the site of Bicester Town station (no sign of that, old or new) and on to a buffer stop, seperating (I think) the running line to Oxford from "The Works" site. The Down is in place through the crossing, and extends far enough north to admit a crossover, but only one length on the south side.
I noticed several sleepers in the crossing area to be hollow steel box section, and used as cable ducts. Never seen this before.