I'm new to Land Rovers and I have a LR Specialist getting my 1991 MOD D90 2.5 NAD LHD safety certified. The last thing to do is replace the wiring harness. Long story short, a harness at a reasonable cost doesn't exist anywhere in the world.
We need a database of part compatibility so that we can use alternate part numbers, then modify or ignore the connections to suit our particular model and modification. There's a retirement project. Add that to the list.