Also, quick acknowledgement to everyone who gave me suggestions for the telephoto lens. In the end I went the other way, and tomorrow I have arriving the AF-S 16-35mm f4 VR and also the FTZ II adaptor. I read that this lens is compatible with the FTZ and both lens and adaptor are weather sealed. All in, came to circa £500. I know for about £350 more I could get a used Z 14-24mm, but thats £350 towards something else!
I wanted the FTZ adaptor as I wanna get a 85mm, and although Nikon sells a Nikon Z 85mm, the prices are silly money, and using an old F series lens is much more cost effective.