Welcome to the forum, not heard of the issue with squeaky brakes on UK GLC'S.
I have it on mine Phil but not always. It's normally fine during my normal driving when I'm heavy on the brakes but squeals loudly during and after towing the caravan when my braking is more gentle so presumably a glazing issue. That's both forward and reverse BTW.Welcome to the forum, not heard of the issue with squeaky brakes on UK GLC'S.