Yep; what they said!
I personally do everything if the job requires me to disconnect the control arms at the hub. Not saying you need to go both sides but if my left needs it, and it was not event driven like something broke from impact than you can assume the wear is similar to both sides under normal conditions. I would completely agree that inners last much longer but I keep full sets on the shelf.
Sweet picture by the way; love it! On that note, not sure what your mileage or normal wear is but by the looks of your picture you are using your LR3 appropriately and I would personally do both if I am paying for an alignment and keep your suspected "potentially life-left" inners on the shelf for spares and reset the clock if you are unsure on the current wear.
Also, check your wheel bearings with the tire on off the ground so you can check appropriate play in the wheel bearings and driveline; the wheel on gives you much better leverage than attempting to check from the hub only. When I check wheel bearings and tie-rods I support the vehicle at the control arms so it is representative of ride height and no tension from suspension travel. If that makes sense?