Hey,
Thanks for the responses!
>Does the erroneous clock speed survive a reboot?
Yeah, i've rebooted the machine multiple times and have seen this issue again and again.
>drift is stored on flash
I've checked the flash drive, and /var/lib/ntp and both locations have a "drift" file (which contains "0.000"). As mentioned above, this happens with NPT enabled in my settings, but also with it off and just a date / time set manually. I assume the contents of my drift file(s) means that it thinks the machine clock is completely in sync with the ntp server(s)?
As you can see, it's gone out of sync by ~4 mins since I last synced (which was when I first created this forum post)
Ian