Yes, those points either do or don't match expectations.
For the unemployed (ILO) not claiming JSA we just compare the numbers. There are some odd overlaps as well (can claim JSA if working under 16 hours, but as both Policy Exchange and Centre for Social Justice point out, the disincentives are punitive).
There's a lot of chitchat in comments about JSA being limited to six months, which rather takes aback those of us who are long in the tooth. The six-month limit applies to contributory JSA - so those not eligible for income-based JSA dropped out in 1995-6 when that changed. This applies mostly to second earners in couples and those with savings worth counting. However, since then the flows past the six month barrier have shown much the same responses to economic change as any other flow rates, there's nothing new.
What seems to be going on is something related to the increasing proportion of women in the labour force (including the above). The availability of a substantial in-work benefit system (Tax Credits) calculated on a household basis, means that unemployed second earners have choices - claim JSA or change the Tax Credit claim. Since the recession started roughly 0.5 billion a month extra has been going onto Tax Credits
http://www.hmrc.gov.uk/stats/tax_receipts/menu.htm. Government has been known to say that Tax credits have helped x families in the recession.
In addition (and for the youth) we also have students. This is not a mutually exclusive group from the labour market. When DWP examined the numbers of unemployed not claiming JSA when the pattern started to behave in unexpected ways they discovered that lots of them were students, at which point they stopped looking. You can see this in their press releases.
We do try and break down the young people statistics by whether or not in full-time education (Chart 6). The gap between JSA and unemployed not in FT Ed has closed a bit, but this is where the rise is. The unemployment rate as quoted is a bit distorted by silly denominators - unpacking what labour market participation means for young people is more than usually complicated, given that employment is 1 hour plus per week, and so unemployment can be looking for 1 hour jobs.
Government response has been to print a guide for parents to help boomerang youngsters who are out of work.
Would probably be helpful if the over-50s lobby would check what was going on before lobbying, but I guess this is too much to ask. There probably is something about over-50s who lose jobs finding it more difficult to get back in, but this is outweighed by people staying in work who last recession would have been pensioned off (regulatory changes in discrimination law).