I told my insurance company about changing my cans and it made no difference at all but as you say all companies vary. I am with Bennetts.
But i do think it is best to tell them even if it does make a slight change in price, otherwise should you ever need to make a claim they will try to get out of it any way they can (no pun intended).

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or olives???
quote motonacio "this is to certify Meach is not the prat you'd think from his posts"
http://www.youtube.com/imeach