The 52 timetable might say they are every 8 minutes but they catch up with each other due to heavy traffic and then they all come at once. You might get three in two minutes then wait 20- 25 minutes for another especially at rush hour when, as someone rightly said, they are then fully of students coming out of Hillsborough College. Many days I walk to Walkley from Hillsborough before a bus passes me.