Interesting, I was looking for that lens for quite some time but seemed to be the best deals were in Germany, US and sometimes Japan. Unfortunately not in the UK. I was looking to use on my Sony bodies. I have not seen negatives of using longer Leica lenses on Nikon but there are many with more expertise than I have. Supposed to be a superb lens. I plan on using many Leica M mount lenses on the Z6 but only up to 90mm.
I finally bought a very good 200 f4 Ai which I use on the Df, D500 and Sony a7rii. Suits me for my use and abilities. Please post some images with your new combo.
Cheers,
Tom