I can't understand why they seem to muck up schedules so bad, for example take a look at Newcastle to Bristol... Yeah we all want 2 daily flights at 19:10 and 20:40 don't we
Not a totally factual example. Depends on the day. You can for instance make a morning departure on Monday, when they offer 3 flights on that day. There's only 1 flight Tue and Wed; 2 on Thu; 3 on Friday; none on Saturday and 3 on Sunday. Granted there are no morning flights with the exception of the Monday, but on those days with two or three flights there is a lunch time departure. Nowhere did I see both a 1910 and 2040 departure on the same day. So I would conclude that the schedule offered is one that maximizes their yield, although it may not suit you personally.