Wiltshire Council have now confirmed that the B4192 road closure (outside Littlecote Cottage), is definitely due to remain in place until the 22nd November 2019.
They apologise for the fact that no advanced warning signs had been set up by their contractor (Ringway). The requirement is that signage should have been displayed a minimum of 14 days before the road was closed. Wiltshire Council are well aware that this did not happen.
It has also been reported that the signage in place for the official diversion is not clear or complete. Wiltshire Council will action this as a priority.