My friend Zena Helpern will soon be publishing a book on a journey which somehow or other (I've not seen the manuscript) proves that Prince Henry Sinclair made the trip, at least to Oak Island. While the Prince Henry involvement in the story is but a very small part, I'm told that our family might want to keep an eye out for Zena's upcoming book. While I haven't seen the book yet, I'm familiar with enough of the research to say it's almost entirely new work rather than the usual re-hash.
Keep you posted,
Steve