Hello gents,
Thanks for your replies.
It was white, and easily visible. Kind of hard to describe, but with the relative motion against the contrail, it looked like a small balloon at altitude.
I looked very carefully for any dimming or occulting due to the other clouds passing in between it and my field of vision, but I could detect none at all. Very strange!
And I now have the afternoon off to think about it some more.
Cheers,
Simon.
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