Phil, this is brilliant!
I know from readings that there were a number of hospitals in the Boulogne area. Do you think it possible to locate were 83 General Hospital stood? Probably now a supermarket but would be nice to walk it.
Was reading the 2nd Royal Irish Rifles in the Great War and for 6th September 1918 the author says the War Diary states the following 'By 3.30pm 6th September, 1918 half an hour before Zero the troops were in position. Three Companies in the Firing Line: A, B, C 2nd R. I. Rifles...' The reference to B Company supports your reading of these documents which is brilliant. The War Diary goes on to mention a crater called U.I.a, a Mortar Farm near N.36.d and a Trench system called T.6.b. Is it possible to make out references to these? I must have a look at the other documents I have, which are equally written scruffily, and post them. Your understanding of them is invaluable.
Am very obliged,
Derek