So you can't be suggesting that a passenger who needs assistance to board — and has exercised their right to turn up and go — should be made to miss their train if it isn't convenient for staff to help them? That would be a clear case of disability discrimination.There is also in most circumstances no reason to delay a service because of the unbooked passenger is still awaiting assistance. After all, the passengers who have booked assistance may well be on those services. Why should they lose out by their journey being delayed?
The inability of the railway to provide sufficient staff to help all passengers in need of assistance in a timely manner would necessitate the late despatch of train for operational reasons. It wouldn't be the fault of the TUAG passenger.
After all, every passenger who doesn't need assistance can TUAG, too.