Adjusting rear brakes

[project25]

Hi all, my t25 is a 1984 1.9 dg engine auto, I removed the rear wheels the other day to have a look at condition of rear shoes. Found I could not remove the drums, thought I should be able to slacken off shoes but find the only hole in the back plate is for checking shoe thickness. I assume the brakes are self adjusting. How Do I get to the shoes?
If the drums are as ridged as the front discs theres going to be a huge ridge to get over.

[bigherb]

The adjusting hole should be here. Not that easy to see from undeneath. Unless someone has put bay window backplates on and not drilled the hole,