[remarking on John's comment that the Special had 1.5" wide rear brakes]
I was sure that was the case, too, (that the Special had the wider rear brakes) but didn't mention it because when I looked in the parts manual, I saw that four of the same part number for rear brake shoes for the TC and TCS - first Item #2. Looking at it again, I see the larger brake shoes listed for the TCS only - second Item #2. That seems to imply that the larger rear brakes were an option(?). Oddly, there don't appear to be any brake drums listed in the parts manual! I also notice that among the standard equipment listed for my car on the window sticker (e.g. heater & defroster, locks for the boot and bonnet, ammeter, tach, engine) it lists front disc brakes and dual brake booster but says nothing about larger rear brakes!
I think you're right that the TCS had the larger rear brakes, but the documentation I've found seems ambiguous.
[edit] first I forgot to attach the pictures, then when I pasted the copy of the text of my post, it couldn't be read. It should be good now for what it's worth.