From what I can tell from the pics, its probably an 81, the 82 had a coin tray in the middle of the dash replacing the speaker grill.

the serial decode is quite simple...
SA- Solihull
L - man subdivision
LH - Model code (in our case RAnge rover)
A - 100 inch wheelbase
M - (B- 2 door M-4 door)
V- 3.5 V8 (carb)
2- steering/Tranny code (1-RHD 4 speed,2 -LHD - 4speed, 3- RHD auto, 4 LHD Auto, 7RHD 5 speed, 8 LHD 5 speed)
A (model year code)
Serial number..

With this info you can decode your RR..


Hope this helps

TG