What lens in the Nikon range would be best for photographing Derwentwater

I would presume you mean what camera lens would be best to shoot landscape scenes of the lake and islands. Then you'd want a landscape lens or wide angle. You can go do the research yourself. Review the Nikon lenses classified as landscape lenses, read the reviews on them, see if you could rent a few of your best choices, and then decide for yourself. You will enjoy the search and its photographic activity much more than simply asking for a recommendation from someone. And, along the way you may learn much more than you had expected. Enjoy your adventure. 
