In New York, as far as I can tell from my experience and sources, the custom is not to sit on the floor on Tishang B'Ab (or the meal before).However, in his code, Chakham Toledano writes that the custom is to sit on the floor -- or at most a low stool -- without any note that this is not the S&P practice. Is it indeed the practice to sit on the floor in London and Amsterdam?