According to UK Serials Resource Centre there was a batch of DR allocated to Mohawks.
DR761 to DR807 Mohawk
The picture is of DR 7**
From Wiki;
French orders were taken up by British Commonwealth air forces, and saw combat with both the South African Air Force (SAAF) against Italian forces in East Africa, and with the RAF over Burma. Within the Commonwealth, the type was usually referred to as the Curtiss Mohawk