What has changed and why?
In the light of updated guidance from the Information Commissioner's Office (ICO) the Government Digital Service (GDS) reviewed the cookie policy for GOV.UK. The ICO have been taking a more robust interpretation of Privacy and Electronic Communications Regulations (PECR). These regulations say that "You must tell people if you set cookies, and clearly explain what the cookies do and why. You must also get the user’s consent. Consent must be actively and clearly given."
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