This does look like the road from the 2nd roundabout around the back of the annex towards the tram station (where the Friday antics take place). The "main" single track back road between Houx annex and the track appears to be unaffected (I hope).
I think I will stick with the normal route in. If I get lost and some id**t in an Audi, Pug or Aston wants to pass they will just have to wait till I turn off!
Simon