Jason D. Tiller
Nigel Bryant hasn't been seen in the forum for eight years. However I have messaged him to see if he possibly has another source, so will let you know what he says. In the meantime, perhaps this article by Mark Chirnside will help? The Enclosure of Titanic's Forward A-Deck Promenade: Popular Myth?It works, but I didn't find the exact answer about Ismay's letter.