Last time Alice tried to use the supposedly "up to every 10 minutes" Park and Ride bus, after half an hour she shared a taxi with a couple who had been waiting 3/4 of an hour.
(The last time I caught a Cambridge bus was when I was still working for Shape, and it turned out it would have been quicker to walk even if the bus had turned up somewhere near its scheduled time, which it didn't. I didn't have a small child with me then though.)