A bell? I didn't know we are required to have a bell?
I believe that we're required to be able to give "audible warning of our approach".
As most of us are able to call "Excuse me"/"Coming through"/"MOVE"/"F OFF OUT OF MY WAY" according to taste/personality, we aren't required to have bells.
(I got some female muttering that I didn't have a bell on my time trial bike. Where would I put a bell on a TT bike! I ask you!)
On topic - I occasionally want to shout "Red Light!" at someone who has ignored one, but I haven't plucked up the courage to do so yet.