I have heard of instances where both Aviance and servisair do not tell crews of CTOTs that have been allocated sometimes for hours. The first the crew know about it is when they call for push and start as the slot expires.
Nice one! Its a disgrace the ground handling at Cardiff sometimes; from an outsider looking in it seems to be appauling, both aviance and servisair.
Although, people only remember the times when things go wrong.
TIO