Answer:
Lose the case and not get any compensation.
Explanation:
The lawnmower company has already made it clear that they're not responsible for any injuries or damage that may have occurred from use of the product so seeking redress in court is a waste of time because by buying and using the product, it is assumed you have read the warning and is therefore bound by it.
Miles won't have much of a case in court and therefore will likely lose the case without compensation.