Tony wrote: Who is good at maths if there are 2.7 million on IB,
There aren't 2.7 million on IB. There are currently just over 2million,
When ESA was introduced in October 2008, 31% of claimants were aged 59-64, so by October 2013 that 31% will have gone from the IB claimant total.
Only around 1.5 million IB claimants are going to be migrated because of this.