Thanks BigCrustyApe and Dakwegmo, your comments are very helpful.
When I said "trails" I should have used "motion blur".
Dakwegmo: your explanation makes it much clearer for me. The fact that it was darkness and the flash was the only light source makes perfect sense.
I'm assuming that if that shot had been taken at the same settings, but with lots more ambient light, 1/30 would probably record some motion blur and the flash would have provided the frozen image.
Again, thanks for your help everyone.
Regards,
Jim.
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