Reduced daily rest, is this legal?

Gembo:
Cheers mate, I had a feeling it wasn’t and that I was interpreting it wrong.
So in essence, I would need at least 9 hrs rest at the end of the 10 hr total drive time?

Once you’ve reached 10 hours driving your shift effectively is over, whether you’ve “worked” for 11.5 hours or 15 hours regardless, you simply cannot drive any more that day. You could however engage in non driving other work until you’d reached a maximum of 15 hours duty time. After that then yes you would need to take a minimum of 9 hours break before you could start another shift.