i think bells are useless. given the frequency of iPods, it’s best to assume they have no idea you’re behind them and give them a wide birth. alerting peds to your presence just makes them act unpredictably.
What’s up with WYD. It’s like soccer hooliganism and unbridled nationalism without the footy. Je ne le comprends pas.
Incidentally a mate of mine has a bell attached to the shoulder strap of his bag - and not on the bars. A bit further for your hand to go in a ‘mergency’ but great fun for the office =]