My cars have the early 180mm diameter drum brakes, I found that the brake backing plate has to be removed from the stub axle carrier after the linings and springs are removed. The backplate is held on by four bolts that are semi-awkward to access unless you have a thin 14mm ring spanner, the driveshaft can get in the way. (Note that the hub itself can be left in place).
The bolt heads don't have to be held as they have a square head that butts up to the stub axle carrier. Once the backplate is loose, the hub is turned around to provide a bit more clearance for the wheel cylinder, then the 10mm bolts can be accessed.