This is important from the OSR consultation
“Producers should be clear about definitions or terminology they use, and these should be harmonised to be consistent and coherent with related statistics and data where possible. The terms ‘sex’ and ’gender’ should not be used interchangeably in official statistics”
I am going to send a bullet point email highlighting some points that I think are key. There will be researchers / data scientists who can put in more technical responses.
e.g. For me, as a lawyer, any data collection that may be used to assess compliance with the Equality Act must be based on sex as that is the protected characteristic.