In Article 6(1) of the UK GDPR (lawfulness of processing), the reference in point (e) to processing of personal data that is necessary for the performance of a task carried out in the public interest or in the exercise of ... official authority includes processing of personal data that is necessary for—
the administration of justice,
the exercise of a function of either House of Parliament,
the exercise of a function conferred on a person by an enactment or rule of law,
the exercise of a function of the Crown, a Minister of the Crown or a government department, or
an activity that supports or promotes democratic engagement.