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Finance Bill

Generally, when changes are made and we want to assess their impact, we carry out properly independent research. On the changes to housing benefit, for example, the university of Sheffield has been commissioned to produce reports, but what research into our short experience of the 50p tax rate was carried out that gives rise to the conclusions mentioned? Do we have some research that we can look at, or is there just speculation that people might have retired or might have gone to Switzerland?