Ahead of Tumble's launch this Saturday, here are BBC One's biggest entertainment consolidated ratings for August since 2006. I have deliberately excluded Lottery related shows from these numbers as these are split into three in the official numbers:
2006 - 26/08 - 21:25 - 5.67m (28.1%) - How Do You Solve A Problem Like Maria?
2007 - 25/08 - 18:10 - 3.77m (27.1%) - Edinburgh Military Tattoo
2008 - 30/08 - 20:55 - 5.56m (25.7%) - Last Choir Standing
2009 - 22/08 - 21:05 - 5.03m (23.8%) - Michael McIntyre: Live and Laughing
2010 - 14/08 - 19:50 - 4.65m (23.8%) - Tonight's the Night
2011 - 06/08 - 21:20 - 4.56m (20.3%) - John Bishop's Britain
2012 - 18/08 - 17:25 - 2.53m (19.6%) - Total Wipeout
2013 - 17/08 - 17:45 - 3.86m (22.7%) - Pointless Celebrities
The last thing to have resounding success in August on BBC One entertainment wise was the Andrew Lloyd Webber strands, although back then it has to be said that In It to Win It was bringing in seven million viewers consolidated.
Realistically, I think we're looking at about 4.5 million for Tumble, when you consider the low ratings all around as of late. Anything else will be a bonus (even considering ITV's ratings), and under four million would be a concern considering the promotion.