I dont think this is Model T era ; Dagenham was not opened for production until late 1931. Before that British Ford production was based at Manchester at Trafford Park.There were lots of English Ford models sold in Australia; maybe from late thirties, into forties era. It may well be from a Fordson tractor also. Some later English Ford adjst. wrenches[ '50's] look like those made by 'King Dick' ,ie. short,fat handle with a 'tang' for drain plugs.