Where is this WW1 tank?

There are those who would like to know where and when this tank was photographed.  The men having a good look around it are most likely from the 12th Field Ambulance Corps.  It is mostly likely in winter in early 1917.  The tank is No 746, and the crew is C17.  I have looked at the Unit War Diary of the 12th Field Ambulance and am none the wiser.  Does anyone know when there was a little bit of snow on the ground in France?  The 12th Field Ambulance seems to have been around Becordel, Bernafay, N. Flers, Decauville, Deauville, Longueval and  Mametz Wood in January 1917.  Does anyone have any further information about it?