TFW have 2 training centres Chester is for the North and mid Wales training and Cardiff for the south / valleys training. So any Chester problems only effect the north, this issue is specific to just Chester depot.
The original plan many months ago was a 8 drivers course just for Chester, this changed due to the Chester backlog. All TFW depots require more drivers so moving the training plan can easily be done. The backlog may be easing soon as the recent trainee drivers with DIs are starting their pass out phase, this will free up DIs to take trainees from sitting at home and get them in the drivers seat.