depends on what type of hole you have sir. simple nail through the middle of the tread, i'll give you 50/50 chances. anything bigger, or in a sidewall and it's the long walk of shame for you. if land rover are so confident it'll work, why don't they give you the salesmans home phone number in case you have a problem ?
I'd see if you could get a cheap steel rim and tyre of the correct size to keep in the boot