There were plenty of young turks at the Edinburgh Fringe this year, but it was good to see that there were some, how shall we put this, more mature performers reminding us that form is temporary, class is permanent. Mark Steel was there showing his son, fellow stand-up Elliot, a thing or two, with a show about his recent marriage split that was highly personal and highly pithy. Doug Anthony Allstars confronted mortalist and multiple sclerosis.