Hopefully I'll be picking up my Clubman next week and one of the options I ordered is a Limited Slip Differential (LSD). How will I know it is installed?

 

I guess if it's listed on the window sticker you got it.
Other than that... I don't know.

 

Armed with a torque wrench, jack up on side, leaving the other planted firmly on pavement (secure MINI with blocks, as you leave it in neutral and NO HANDBRAKE!). Try to turn the lifted wheel using the torque wrench, and note at which setting the 'click' actually begins to move the wheel..this is the torque required to overcome the clutch (typically less than 30ft/lbs but the manual should indicate the exact torque required). If both wheels jacked in the air, both should spin the same direction.

 

Thanks Alphawave!