My local Nissan performance dealership confirmed a couple of years ago that they no longer sell the roadster in the UK. I cant remember the exact number but he stated nationwide Nissan only sold 15 or 50 in the previous year, no demand meant supply was ceased. This may change but I imagine that is unlikely.
It was an interesting discussion. He was saying the 370 is a difficult brand to get across to the public. Customers come in two forms, the majority don't know Nissan sell performance cars so when they go in looking for a standard car they see one, are interested but its not practical / too expensive. Those that do know Nissan sell performance cars go in looking for the GTR so the 370 wont fit their needs either. Its in a tricky niche that isn't widely advertised. The roadster is then a specialisation in that small niche - so there is practically no demand, as there is no awareness that the possibility exists.
Makes me happy though, i have a rather rare car on the road which suits me.