Re: Missing the point
It's already allowed for:
Recital 10 "This Regulation also provides a margin of manoeuvre for Member States to specify its rules, including for the processing of special categories of personal data (‘sensitive data’). To that extent, this Regulation does not exclude Member State law that sets out the circumstances for specific processing situations, including determining more precisely the conditions under which the processing of personal data is lawful."
Articles 9.2(g) and 9.2(i) implement this.
Allowing that once the UK leaves the Union "member state law" becomes "domestic law" (see the Keeling Schedule to the GDPR), the powers can decide that almost any processing is "in the national interest".