www.taxpayersalliance.com/327_public_bodies_paying_stonewall_over_1_million_each_year
(Has also been picked up by various media)
A TaxPayers’ Alliance (TPA) investigation has found a total of 327 public bodies were paying into Stonewall's Diversity Champions scheme. Between 2018-19 and 2020-21, this saw Stonewall receive over £3 million of taxpayers’ money.
The TaxPayers’ Alliance is calling for an end to the practice of taxpayer-funded lobbying, so public money is not used to distort political decision making by advancing policy positions taxpayers may seriously disagree with.
I've not read the report yet, but that's a couple of excerpts from the media summary.