These ladies were undergoing induction at the Royal Mail training centre, learning everything they needed to know about the Post Office's business. Once qualified, you could say they had letters after their names!
Despite the light, bright modern Post Offices we now have to contend with, there was something very reassuring about the old wooden counters, the rubber stamps and those little rubber thimbles the tellers used to count out our withdrawals.
Even though we suspect this was a dummy parcel for training purposes, we wonder what the cool customer in the grubby Mac and snap-brim hat was saying to the girl. If he came from down the coast, he might be an Ayr male.