It's a hard knock life: My vintage lightweight Tweed Run steed.

Hmmm, the dynamo looks like it should work. Bear in mind they are directional... Tried swapping the terminals on the lamp? If not then has the bulb blow? Cannot see what has gone wrong.
In the future, try putting a light fixture from a modern led torch in rather than the bulb, makes it incredibly bright and actually useful!

its working! put a new bulb in...... took a bit of hunting to find one.
i really want it to be as authentic as possible. putting a light inside the lamp just wouldn't cut it for me.