Thanks to James. Jude. Tom, Russell & Rob for your responses - much appreciated.

Just to nail this as I'm still just a little bit unclear:

QT Pro is not on the FCP discs, so the correct procedure appears to be to simply upgrade the non-pro version by registering the Pro serial number.

I have now registered my existing normal QuickTime player with the Pro serial number. In registration box, it shows QuickTime 6 Pro, so that's all fine.

The actual QuickTime Player I launch from the dock remains the normal (non-pro) version 6.5.2. So are the unlocked Pro features embedded and specific just to Final Cut use, and the stand-alone player remains just the normal so I don't have Pro use for anything outside of the FCP app? This would mean I would have to purchase QuickTime Pro for separate use?

Thanks for bearing with me.

Matt