Hi,
Reading down the thread it appears that all the mechanical side of things is fine , therefore I would look elsewhere.
If the bump did not hit the sump or the gearbox cross member I wonder if it has hit a seat mounting bolt, or two. This may may giving enough play in the seat to touch the transmission tunnel, and therefore give momentary contact with the prop shaft. I doubt that anything serious is going to happen by continuing to drive it , but do get it checked soonest.
I would keep a very close eye on the oil level though. As others have said the sump is the most vulnerable point of a Roadster and even a small knock can initiate trouble.
Good luck , having a niggling problem can be distracting at the best of times , doubly so when on holiday , so try to enjoy the holiday. Mogs are quite tough and it will come through it.
