Yes, I realise that - but, as I said, if it was an 'inferior service' they would not actually have to do it "just as they had been doing it before" (for the 'superior' service). For example, they could stockpile mail and just move it around the country once every two or three days, rather than every day.I think the point with the post was that if there was no high-priority mail they'd just have to get on and deal with all of the mail at the same time, just as they had been doing before.
Kind Regards, John