In my solicitor role, I would often be asked about a situation where a pupil or parent had covertly recorded a teacher or teaching assistant. The question was usually ‘Is this a data protection issue?’ My view on that was ‘No’. Why? – Well, because the GDPR does not apply to the processing of personal data by a natural person in the course of a purely personal or household activity. A recent case involving a similar situation – a patient recording a doctor- has come to the same conclusion, meaning that there is now caselaw support for my interpretation of the GDPR. The case is Mustard v. Flower

https://www.bailii.org/ew/cases/EWHC/QB/2019/2623.html