It's all a bit confusing Henk. If you google 'Lucas 31482' it comes up with the switch Kostas just bought which is for post war Tiger Cubs and the like.
31482 is also the number for the pre war switch you have. So it looks like Lucas used the same number even though they altered the toggle switch.
According to war time pictures, the one you have looks correct for an early war 16H and probably others. If it's for 1" bars I'd like to arm wrestle Kostas for it. It would be completely waisted on Noddy's car though Ron