The Van fleet is also very old and unreliable.They park the van and then spread out to deliver to surrounding streets on foot, meet back at the van and drive a bit further. Big stuff they can't easily carry gets van delivered to the door.
It's actually a reasonably efficient way of doing things.
The doors are literally falling off the vans in my area.
Management won't bring in hire vans and the royal mail repair garage has a delay of several weeks.
In my office there is a constant lack of vans so you end up having to share even if it's much less efficient.