Yes. Thanks, BB. That answers DaveW's question about the Revalidation, but I still haven't been able to find a reference in Part.FCL, or the AMCs that supports my statement that all instruction should be signed for. So I'll continue to search for that.
On the Revalidation flight, though, as long as instruction is signed for, you can then pick any hour of instruction that falls within the prescribed period to use for revalidation. It doesn't have to be nominated as such at the time of the flight.
MJ