With apologies to all for resurrecting this thread, but as I am on leave and in western Europe, I have replaced the stolen Nikon and wished to inform all who were kind enough to offer advice, support and ideas what "happened next".
Essentially, I have done as Electroshock and Alex72 suggested, which is to "ride out" the film age "in style". Thus, I treated myself to a "used" Leica R7 and a Leica zoom 35-70 lens which I intend to replace with the Leica 28-90 in due course, when I can lay hands on it. Prime lenses will be more suitable when I am travelling less, and I am more than open to all of the arguments (especially concerning quality) that prime lenses offer. At the moment, my main problem is two-fold and practical; I live and work abroad, and do an awful lot of travelling. Moreover, I do a lot of walking in cities (old cities above all) and in the countryside and mountains, so carrying extra weight in suitcases, (never again, for a camera after the felonious removal of my Nikon) or in person, does, or can, become an issue.
Yes, I suppose there is a bit of self-indulgence in this purchase, but I always wanted a Leica, I can now afford it, and so I bought it a few days ago. In any case, I have spent the week-end just beginning to get to know it. It is like when I return to my MBP after a few months abroad (my work environment is exclusively Windows based) and I have to remind myself of where the necessary controls are.
The technology on the Leica is from an earlier time; no automatic loading, or winding on, or auto-focus; instead, I have to work at taking a photograph. However,it is beautiful to hold - is exquisitely balanced in the hand - and feels right when prowling looking for angles, shots, and the right light. For now, I'm enjoying it, hugely, and can enter the world of digital photography when the need, or want, arises.
Luminosity, I looked hard and long at the D700 and have to say I found it too big (and too heavy with the appropriate lenses, but it is a lovely piece of equipment). The K7 is an attractive option, and one I shall think about seriously, but I have not seen one in stock anywhere yet.
Once again, a warm thank you to all of you who took the thought, care and time to respond with such a vast (useful and very welcome) amount of information. I have learned a lot from this thread and I'm truly grateful to you all.
Cheers and good luck to you all