Thanks - may give them a call.
Just inspected the car - the right rear is also flat spotted. So 4 in 2 years, 3000 miles. Wonder if it's more prudent medium term to ditch these in favour of something else?
Good luck with that!! There are a few aftermarket wheels that can fit but they need to be made to order. For me that isn't an option as the COC says 19" - so 19" it will have to be.
1 buckle in over 2 years and 10000+km isn't too bad.