I have to tell you my story from the wild british isles... In july/august last year I took my family for a drive from our home in Norway to the UK (via Denmark, Germany, Netherlands, Belgium, France and the Chunnel). We did of course drive in our pearl white P85+ (delivered August 2013). A few other model S were seen in London around the supercharger at the royal Victoria docks (at that time the only in UK).
The really cool spotting was actually done by a colleague of mine from Slovakia who happened to be sightseeing in London one that same late Sunday morning as my family and I drove by GPS from our hotel towards the supercharger. The route took us past most of London's downtown landmarks... down Pall Mall, past Trafalgar Square, down Whitehall, a turn by the foot of Big Ben and then along the river banks towards the supercharger...
A few days later I saw his post asking if the white model S with Norwegian plates he saw driving past Trafalgar Square that Sunday morning would have been us! Imagine the odds...
While in UK we drove from London to York, then to Liverpool, then back to London. Apart from around the supercharger in London we saw no other model S anywhere.