UPDATE - Wanted to say thanks again to all who chipped in with their valuable advice.
I plumped for the Nikon D5200 (which came with a 18-55mm kit lens) and I also bought a 55-200mm Nikon lens (well, my partner chose that one!). We thought that would give us the "range" for now but I'm sure in a couple fo months we'll be trading up to specific prime and zoom lenses
So, a big thanks again