In one of Roy Clarke's other shows money/prices are frequently mentioned . In Open All Hours as Arkwright is fleecing his Customers prices are constantly mentioned and money is handed to Arkwright but very little change comes back the other way . The funniest aspect to me is the till , no not the grabbing drawer but the amount of money being run up it never shows the real cost of what is being charged . I know this is a prop because the money drawer snapping shut is someone pulling a string so in essence being a prop , pressing the keys just brings up random figures in the display window.
I assume in OAH Roy wanted to put more emphasis on the money grabbing side than he did on LOTSW .