Other than steel rims, I doubt ...
	
	
		I doubt that there is any fancy aftermarket alloy rim made that meets factory numbers for the 3. Well, maybe Cromodora makes some but they would not be cheap.
 
I would expect that there are aftermarket steel rims made for real working vehicles that meet LR spec, but that is why they are steel and are for working vehicles. I wonder what the Police spec Discovery's use - alloy or steel? Generally here in North America, all Police vehicles, (mostly Ford body on frame Crown Victoria's), have steel wheels; the civilian market gets alloy. The Chev Suburbans that the SWAT guys use are all steel wheels as well.
 
I alway think the one who writes the cheque is the final authority; that is most often the insurance company.