Sorry, I forgot to get back to this. Busy day!
The correct answer, guessed by several posters but by Tony Muldoon first, is Royal West Norfolk GC, aka Brancaster. I don't have the letter in front of me now to quote it exactly, but the redacted words were in reference to the tides.
EDIT: Now that I think about it, though, it's really a shame that so few clubs in the world could plausibly have been the one to write this. And, as George P. said, it did sound a bit like The Carthage Club.