When I was a teenager in West Yorks, around that time, there were plenty of coffee 'bars' as they were called. We used to hang out for a whole evening, often only buying one coffee. I don't remember ever being asked to buy another, or move on ! Mind you, most of them would have either the 'elf and safety' or food police onto them these days !.We probably spent more money in the juke box and on the pin-tables than we did on coffee.