(2 hours ago)Adrian wrote I don't know why you would deliberately do this? I think it's bad enough that times adjust during the school run on an afternoon, but at least I know why, and they generally do so with the same gap between services.

Whether you've got an app or not is irrelevant. Most people's thought process works in that they know a bus is due X, Y and Z past an hour. I know people who know railway services inside out, where there's much more open data available, but they still know the departure times - and because it's clock face, it's easy to remember.

Would it be helpful to avoid the effects of imported delays caused by interworking, it may also avoid having to add an extra bus to the pvr that could be used elsewhere. 
Also, Could timetables be designed so that some services are clockfaced over a 2 hour window instead.

Example 1:
Hour 1
2x X45, 1x X46

Hour 2
1x X45, 2x X46

Then repeat the same pattern every 2 hours.

Example 2:
Lets take the 22, you could increase it to every 40 mins, which in turn would allow it to have longer layovers at both ends, the pvr would be 2.