Not every data subject request must be fulfilled in full. UK GDPR and the Data Protection Act 2018 Schedule 2 provide specific exemptions. You must apply them carefully and document your reasoning.
When applying an exemption, you must still acknowledge receipt of the request and tell the individual you are applying an exemption (unless doing so would prejudice the exemption itself, e.g. in a crime prevention context). Always seek legal advice if uncertain.
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