My expectation is getting into the bags both ways at Louth and Brampton.
The system has been altered a bit to accommodate the increase in the number of bags, and to be able to access them. They're available both ways, so assuming 850 x 2, that's 1,700 retrievals in two days.
Heather is coming down to Loughton, so the bags might stay in the large sacks for picking up at Loughton. They're on loan from a friend who has a firewood business.
I can see why PBP have never got into the bag-drop business, but this sort of organisation would work for the commercial companies who offer PBP tours.