I think it's scary that if you have a country where maybe 1% of your over-spending problem is with certain benefit claimants, that rational people will still pretend that it's the major issue of the day.
IMO that's sleight of mind though.
You have 1/4 of the government's money going into benefits, which is a very large amount - you have to go after it. And of course it's it's not all in one place, so you have to look at savings across a range of areas, so there will clearly be many areas with 1% here, 1% there, but the sum of them all is a very much larger number.
And bear in mind that the money that can be clawed back in tax evasion, 45% back to 50% tax rates, bankers bonus windfall taxes, Trident cancellations etc are not huge either in comparison to total spending, so the whole rebalancing is on the margin.
Pensions is the shit this country is in, and decently paid young-to-middling workforce is the only way out.
I agree with that, and I am sure that there is quite a lot that can be done inherently, that the Tories are featherbedding - but big picture I don't think you can really make a difference while still spending more than you can tax, because then all the money you can borrow from the capital markets just goes down the plughole, your debt to earning rate (or whatever its called) rises until no one will lend you any more at an affordable rate.
IMO you have to get spending below tax take before you can start to improve things by borrowing to invest in productive infrastructure.