Here's a turn up for the books - after days of no doubt frenzied discussions, Marketing Leeds have responded. My correspondent is Duncan (we are apparently already on first name terms) who tells me that "as you will no doubt be aware, it is impossible to copyright a placename, or indeed any standard English word. The copyright symbol included in our brand design therefore refers to the image, form and colourways of the logo as a whole, which, as you will understand, do require legal protection from copyright infringement."
Don't you love the use of "colourways"? Can someone tell me the difference between "colourway" and "colour"? No, thought not. So it seems that we can go on referring to Leeds, but not in that particular, er, colourway. That's a relief.