Hi McS Junior,
As you are posted to Germany I take it you are with the Army? As such when you register your vehicle you will BFG it with the MOD so will not be paying any road tax. You will also have a monthly allowance for subsidized fuel, which is a big bonus. Regarding left hand drive Disco's you need to to PM rejo. He lives in Holland has a LHD Disco and knows the best places to look for them, cheap! However, the headache you will then have is registering a vehicle to BFG from a Dutch owner in Holland. We all kept our RHD vehicles with no problem. You drive a lot more on motorways in DE so the need for LHD is not as important as you would think.
Cheers,
Paul