Many banks that offer insurance aren't actually in the insurance business, so to speak, they are more of a sales agent. PC financial previously offered their insurance products through Scottish and York Insurance Comapny. (when this is the arrangement it is disclosed by saying "underwritten by......" PC's new arrangement is with a few companies now. One of which is Aviva, who bough Pilot (or maybe it was vice versa, I can't recall). hence Aviva-Pilot.
Rates are all over the map this year. Check out this thread which lists what companies increased their rates in 2009, and by how much.
I'll be posting another list for 2010 once all the Q1 numbers are out.