David Butt's presentation at Macquarie University just now.
https://content.echo.mq.edu.au:8443/ess/echo/presentation/94115ada-3f4e-4365-9692-4d55e4a1a46c?ec=true
https://content.echo.mq.edu.au:8443/ess/echo/presentation/94115ada-3f4e-4365-9692-4d55e4a1a46c?ec=true