In reply to Declan:
Its close on 20 km so probably more than 10 minutes by taxi given the nature of the road (narrow & twisty in places).
I thought getting from Turin to Briançon was easy, but thats based on what friends have told me & maybe only true in the ski season.
I've always gone by car or night train from Paris - as said, get on train around 10, arrive just in time for breakfast