You asked
Please tell me how many letters ONS received as part of the 'Sex in the Census' campaign (https://sexinthecensus.org/) from respondents objecting under Article 21(1) of GDPR to the information provided in response to Question 3 being processed as anything other than their sex registered at birth.
We said
Thank you for your request.
The Census was sent to 27 million households and in response to the 'Sex in the Census' campaign (https://sexinthecensus.org/), the Data Protection team received, to date, 533 letters objecting under Article 21(1) GDPR to the sex question(s) in the census.