In reply to:

Mark Lord's mp3tool doesn't randomly drop frames on the floor, but will only repair an existing VBR tag, not create one.

It's possible that I patched my copy to create a new one. I certainly remember patching Florian Maul's mp3info(*) to write VBR tags on MPEG-2 files, so perhaps that's what I was using.

(*) From the mp3lister sources.
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Toby Speight
030103016 (80GB Mk2a, blue)
030102806 (0GB Mk2a, blue)