Spotted...

I find that my voice works better than a bell. I have tried various different cries such as "Watch out" or "cyclist coming through" and "excuse me please" but they seemed to be ignored, often by non English speaking tourists. A stroke of genius presented the answer. I now shout "ACHTUNG!!!!" very loudly. It's impressive how everyone jumps swiftly out of the way.

Good shout...my chum richard used to scream BANZAAAAAAAAAAAi! when confronted by unruly peds. It was a scream.