Re: Best way to keep a UK car in Geneva?
From the French side,
France does not have road tax, but tolls on highways. (paid approx 60eur in tolls yesterday from Cherbourg to Geneva).
You can get French Insurance pretty cheap online, but the car will need French plates.
all you need to know about importing is here:
You can keep your UK reg in France like Switzerland for 12months, but bear in mind, your insurance at home will most likely only cover you for max 3 months abroad at any one time, be careful with that, especially with some nutty french drivers around...
Honestly, If I were you, and having experience driving all sides of the spectrum, (left hand on left hand, left hand on right hand etc etc), I would just put your motor up for sale in UK and use the cash to buy something down here. Easier driving with the wheel where it should be. And an advantage in FR (not sure about CH) but a CT (MOT) has to be done before every sale, so you'll be sure it'll drive at the very least on a sale. I've bought two cars so far, not had an issue.