"I wondered how you knew the video was <a href=""https://www.youtube.com/watch?v=iZnLZFRylbs&amp;t=5m10s"">5:10</a> long right near the beginning", "some clever trickery going on here" I thought. Then I got to the end and realised it was a guess with a bit of infill - nice :-)<br>Thanks again Tom, interesting content, as always.