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There are adjusters for the rear drum assembly on the rear hubs. I believe you have to remove a rubber grommet, and then it's easy to turn the adjusters with a suitable screwdriver. Not sure which direction tightens, and which direction loosens. My dealer adjusts mine as part of every service.
Theres an aduster on the back of the lever. You'll need 2x10mm spanners (I think??? could be 12mm though)
May need to take the rear lever suround trim, off first though!!
Got around to trying that last night. The two nuts on the back of the lever were slightly odd to get - at first. But got it sorted anyway! Only took about 10 mins.