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I thought I wrote a post here after the last non-existent-AI-buses issue was resolved... guess I didn't, so here goes:
In the AI-Traffic tab of the Options, there's a slider labeled Schedule priority, with values from 1 to 4. The higher this is set, the more scheduled (timetabled vehicles, like buses & trains) traffic you get and the worse the game performs. Cotterell is set up as follows:
No scheduled traffic at all.
AI buses on U18 only.
AI buses on U18 and AI-only routes.
AI buses on U18 and AI-only routes, and also trains.
Thus, if you have this setting at 1, you will not see any AI buses at all, this is intended behaviour to allow for users with not-so-good PCs.