Peter Millard wrote (see)

Apart from the fact that no one seems to know where the trail is, or which way round you are supposed to ride ~ can anyone tell me where you park when you arrive and is there a charge for parking?

Confused of Stroud

 

Thread from the dead! 

If you come in the bottom entrance of Ashton Court there is a fairly obvious car park, but you can't get to it if you enter at the top.  There's no charge for parking.

The original waymarkers suggest that you ride it starting at the top entrance to the estate, but since most of those markers have disappeared and parts of the trail 'flow' better in the other direction it is mostly now a free for all, keeping your eyes peeled for riders going the other way.