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@rive_gauche
Just come in from a long day, here's what may be occuring:
What you think is neutral is at 230V, live is at lower potential. There being no earth reference isn't helping either.
The lamp filament is therefore charging up and reaches live potential, you don't need much potential difference for a 6V transformer to produce enough magnetic flux to start a simple fan.
Or I could be talking bollox.
One important point - having metal termination boxes exposed at the surface of the ceiling or wall, with metallic conduit, using only two circuit conductors and no protective earth, is elevating the risk of both electric shock and thermal degradation.