Would I also need to ask for the all season tyres, or is the knuckle mod enough?
The Pirelli Scorpion Verde can be an all season tyre so maybe the car has them already?
The steering knuckle will only be done free if the car is still within its 3 year manufacturers warranty, or you come to an arrangement with the dealer. I think its over £4000!
There was a big difference to the car when I had mine done and even with all my issues I think the GLC is inherently a good car, as long as you get a good one.