BX51 Just done the same as you, fitted towbar and original rover loom to a tourer, towbar was the easy bit, electric i did struggle with, the instruction book was worse than useless, but took tablet out to car and using photos found on here
managed it.
Never have I seen such a pile of trim,
looked like I was breaking the car, ended up with head torches putting it all on, but really impressed that it all worked, and impressed with the way the 'proper' loom works on lights, sensors etc.
very gratifying when it was done though!