Hi Scott. Early payments of the GCB have been paid early (as Ade said) due to financial hardship as a result of the pandemic.
The norm is when you collect your new vehicle, the dealership will take possession of your old motability vehicle. They will complete a checklist noting it’s condition, taking into account general wear and tear. The dealership then sends that to MB who process your GCB approx 7 days later.
Hope this helps, good luck with it mate ?