How small a window and what part of london? Herrods has about anything you could want to smell in the niche bucket.
If you want some interesting ones, LDDM is a good choice. While at the tauer booth check out lonestar memories too. Incense rose is another of my favorites, but not in the line of what you are talking about above. If smelling SL's lineup, cuir mauresque if big, thick, and complex. I love Mona d orio cuir if you like spicy leather.