I made it. Once I was through the choke point between Dover and Calais it was more or less smooth sailing. Once in the channel I ignored most of the contacts I picked up unless they were warships. Steered away from them and dove to periscope depth if I needed to. On the surface at 15 knots during the day, underwater at 0630 and traveling at 2 knots silent running until 2000.
Went off without a hitch. Might be a different story in the future, but I live to tell the tale.