Thanks for your suggestions. I've knocked up something along those lines, which works until the end of the script at which point I see a barrage of errors on STDOUT, e.g. 

Unbalanced string table refcount: (2) for "VERSION" during global dest
+ruction.
Scalars leaked: -3118

[download]

Do you have any idea of what this might be?

In reply to Re^2: Tk + threads by knirirr
in thread Tk + threads by knirirr

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