> a government supplied app, that’s guaranteed to protect my privacy
This is a bit of a 64,000 euro question, though. Look very closely at what the government exemptions for GDPR are.
What are they?
https://ico.org.uk/for-organisations/uk-gdpr-guidance-and-re... for example. (Yes I know about Brexit, but this is basically identical to when the UK was in the EU and subject to the Directive)