The caption on the back of this photo reads "Arrived 20/9/17". The Unit War Diary says that on 19th September the Unit moved to BAVINGHOVE, and then by bus to Le Nieppe. On the 20th it says that "3 Motor Ambulances with 9 O.R. (other ranks) detached to 20 M.A.C.. Motor cyclist detached to 1st Aug Div. 1 O.R, evacuated sick." Reference to Harold Williams' B2455 shows that it was him that was evacuated, with what was later reported as scabies. Harold is in the above photo second from the right.
The date on the back of the photo doesn't accord with the unit diary, which says they arrived on the 19th, unless they are the nine detached to 20 M.A.C,, except that there are 10 of them in the above photo not nine. Unless they didn't count Harold who was evacuated.
On the whole they looked none too pleased about their change of accommodation, though Harold looks his usual chirpy self, despite being on the verge of being sent off with scabies.