Possibly. However given that the effect of this year's budget ignoring tax credits is rather regressive I think the extent to which tax credits ameliorate this (or fail to do so) is an important part of the picture. Having look at the documentation for them and rapidly given up, I'd kind of hoped that the professionals would do a better job.

Frankly the BBC has a large enough news operation that you'd have thought they'd be able to produce their own graphs, too...