Marks sell-out show Who Do I Think I Am, revealed his natural father was world backgammon champion. Now the star of Radio 4s Mark Steels in Town, and newspaper columnist of the year, he is back at the festival with a new show guaranteed to make the world seem even more mental than it is. ***** (Mirror). ***** (EdinburghGuide.com). **** (Guardian). **** (Sunday Times). 'Excellent stand-up' (Times). 'True comedy gold' ***** (Herald).