Please tell me. Living and working in London, UK I wouldn't go so far as to say that it is the exclusive tie knot, but it is the most common one and one that I wear, especially with spread-collared shirts. I have seen so many comments of late where new posters are posting pics, and they are slammed immediately because they have ties a windsor and not a FIH. And not always told in a gentle way, but pretty aggressive sometimes. I have a feeling that the responses will be in the region of 95% against the 'windsor'.