Nick, I have one of those as well but sadly I believe the magnets have given up the ghost... does yours make any watts/volts?
Never measured what it puts out, but it lit the bulb ten years ago when I ran it 2 or 3 times. I’ve got an old low quality video somewhere out there on YouTube...
I have another Bing with vertical boiler and long wood/lithograph base, also from Robin’s collection, that has the same dynamo.