In general the way the benefits system has changed in the years leading up to 2010 is that it's tried to move towards recognising the many and varied individual circumstances that people who receive benefits need. This complexity is coming with a system that is rather unwieldy, rather costly -- but also is probably more realistic in reflecting society than various one-size-fits-all caps, or Universal Credit. The problem with reforming benefit to simplify it, then, is that this simplicity inevitably comes with less "fairness" rather than more.
In terms of comparing the money received on benefits against minimum wage, what this should demonstrate most is that the minimum wage is too low, rather than benefits being too high. Of course the Conservative Party opposed the Minimum Wage when it was first introduced but have now accepted it and have continued the increases. They should go further still in that regard. On the other hand reducing the money paid out on benefits means that those on Minimum Wage and those on benefits will struggle to make ends meet, and is therefore rather a punitive measure and, I think, the wrong attitude.
The entire philosophy of benefits caps, Universal Credit, ever-increasing conditions to be met to claim JSA, etc., is to assume that people on benefits are, by and large, the "undeserving poor". For a minority this may be true, but the way in which the system is being reformed harms the vast majority of honest claimants who have fallen on hard times and treats them as somehow responsible for the mess they are in irrespective of whether or not this is even remotely true. In many cases it simply isn't. And anyway, why should it matter? It isn't a crime to, say, make mistakes with money by not saving during the good times. A mistake, but not a crime, and I don't see that it's right to punish such mistakes by handing out less. It just creates victims.