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Thanks for that, Ed.
I am extremely dubious that this simplification, or any, will work, because I feel it overlooks the reason the system got complicated in the first place. There are few administrators, if any, who enjoy systems being so complicated that it's nigh on impossible for even the administrators to follow what's going on. So it's not really someone's idea of a joke. No, the complexity in the system, to a great extent, has to be there to reflect the complexity of like and the people it is trying to help and provide for.
The reason, then, that the six benefits that will be combined into UC were separate is because they reflect separate reasons for needing the money -- and, so, separate tests are needed (if you means-test) to work out how much should go to each person. Amalgamating the benefits will mean combining the tests, but that is not at all easy to make happen in practice -- because of the very reason they were separate!
There is a fundamental problem, then, because people are I think missing the fact that complexity is sometimes necessary. Again, to quote (I hope correctly) Einstein: "Everything should be made as simple as possible, but not simpler." I think that UC will turn out to have been an attempt to make things simpler than they actually are, and will backfire rapidly once the Ministers realise this.