Like I have been banging on about for quite some time. They charge double what they bear in processing costs, by their own admission. If they don't have enough staff then they need to hire. If they are not hiring enough staff to cope then that is a failure of their management. In actual fact the accusation should be levied quite a way up the departmental "food chain".
Same for those waiting on FLR just now. More hiring needs to be done.