Honestly, though check out this from Wessex Bus:

http://www.wessexbus.com/news/Servicechanges22ndJuly_481.html

"We have suffered a number of issues with service 19 – things we do not experience on any of our other routes across Bristol. It has horrendous reliability issues and in order to timetable this effectively we would be changing it daily. We have therefore taken the Commercial decision to withdraw this service based on the resource it will require to attempt to run it more reliably"

Incredible stuff. What the hell goes on on that route? You'd think this was a comment from a passenger not the person running the bus!