I have a U.S. 2004 L322 with the BMW M62 mill, 112,000 miles. I use it pretty much exclusively for towing a camping trailer to remote mountain and desert locales, and therefore have tried to preventively replace some underhood items that were likely due for failure anyway, including the water pump. (Perhaps I should have done the same for the alternator, which died violently a month ago outside a mountain town in a smoke-filled, screaming rage.) Find places on the map where there are definitely NO Rover shops around, and that's where my L322 lives.
I currently have one spare, new ignition coil I keep in the ride in case one fails. I think I recall a Land Rover mechanic telling me "100K-150K miles" as a typical failure point for M62 coils. Does that sound about right? If they're mostly spent by this point, I might just consider replacing them all with new....or not....depends.
Sounds like the fuel injectors have a somewhat longer lifespan, and therefore shouldn't be an issue other than perhaps carrying one spare.