In your breakdown (second comment), if you take the under-16s out from total pop, you get 51 million.

But the real humdinger is that roughly 800K "new jobs" have been created from 2013 Q1 to 2014 Q1, and half of those are self-employment. There would seem to have been a very sharp rise in self-employment, concentrated on 2013 Q4 and 2014 Q1. This is prima facie evidence for the thesis that jobseekers are being encouraged, in significant numbers, to become self-employed.

Next stop, is there a concomitant rise in working tax credit payouts? I don't know if any figures are available for that.