I have received the following update from Mercedes, as far as I can see they have removed the word Active, I am not sure how the car should operate with just park assist? They have also confirmed that my car should have it so why can't it be turned on?
Thank you for contacting Mercedes-Benz Customer Service.
I have confirmed with our Marketing Department that Active Park Assist has correctly been removed from all Marketing communications. The functions which you refer to are still available. "Parking Assist with PARKTRONIC and "Parking Package with 360° camera". However, Active Park Assist has been discontinued as per EU Regulation UN R79, as described in our previous correspondence.
The "Active" part of the Park Assist feature has been discontinued. Moving forward a car will no longer actively search for parking positions at low speeds.
I can confirm that your Mercedes-Benz GLC still maintains the Active Park Assist feature. It is recorded on the car’s Specification Sheet as Code: 235 ACTIVE PARKING ASSISTANCE
Please refer to your local Mercedes-Benz Retailer for assistance with this function. All our Retailers are privy to the same information as this office. However, should you wish us to investigate this with your Retailer, please inform us of the Mercedes-Benz Retailer involved.
Should you have any further requirements please do not hesitate to contact us.