The tandem has not revealed itself in silver. Not one snap can I find where the tandem sits there demurely with two personages aboard. Or even one. Must have been the weather. The image got washed or blown away before it reached the lens. Or it fell out the bottom of the camera. Since there seems to be a lack of gaffer tape about the place - and all weekend end too, I suspect the latter.
One thing is strange though, snaps of hills remain. I found these today after sloshing the film about in random chemicals and the like. They sit there. I wonder if they know where the tandem snaps went? They do look a bit guilty.
I shall search again. Meanwhile you can see the two tandemist here and here.