So started to check the different bulbs etc, and during this process, the light started working, but as if it was not connected, so flashing, then 1/2 flashing, like a loose connection. I turned on the main beam, just for randomness, then off again, and now its working (for the moment). Seems like a loose wire possibly, but not got my Haynes manual yet, so no idea where the connectors go.
I believe its capless, as in pure glass, with only the metal connections/wires. No metal sheath etc, just glass. Its a 12v 2w bulb (although the new one sold to me was 12v 5w, which they say is fine)