Yes, I'm aware of that. Being broken up upon arrival wouldn't preclude them from marching in London if they arrived in England and then moved to France; as opposed to shipping directly to France. About a decade ago I made myself a handy table and that's what I used for the dates I referenced in my previous post. I didn't include "ports of debarkation and arrival" so I have no idea if they shipped to England or France. Enjoy.
http://5madfarmers.com/trap/ww1.png