The IFS have produced a chart that makes it look like the Labour Party manifesto for GE2017 was regressive and plenty of commentators are reproducing the figures. However, economist Alfie Stirling points out that the IFS missed out quite a large chunk of data from their calculations. It’s an interesting read.
http://www.newstatesman.com/politics/uk/2017/07/why-labours-manifesto-wasnt-regressive