From a quick search:
>> Patriotic Millionaires UK is a nonpartisan network of wealthy individuals in the UK who publicly advocate for higher taxes on the rich and progressive economic reform.
>> Tax Justice UK is a non-profit, politically non-aligned campaigning and advocacy organization working to ensure that everyone benefits from a fair and effective tax system. The group focuses on building a movement for progressive tax reform, pushing for policies that tax wealth and excessive corporate profits at higher rates in order to better fund public services and redistribute wealth
I'm sorry but if someone posts a study conducted by NRA on gun violence, most would view it with suspicion. I think we should probably view this study with suspicion as well given the groups that were conducting it.