Thanks SuicideJunkie for your amazingly quick response. But ... it doesn't work for me. I get the same results as before.
You've prompted me to retry the whole exercise in a cmd window, and lo and behold everything works fine there. It's only when running it from a script that it fails. Very strange.
I've since realised the different results from the script and the interactive session were because the latter was using Strawberry Perl, which doesn't have this problem. Mystery solved. Duh...!
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