Once the Brexit transition ends, economically inactive people who do not hold private comprehensive health insurance will not be considered lawfully resident in the UK, until such time that they are granted a status under the EU Settlement Scheme.
Last year the UK Home Office agreed to create a grace period of six months after the Brexit transition period ends on December 31st 2020, to allow European Economic Area and Swiss nationals more time to apply to the EU Settlement Scheme, which guarantees their ongoing rights in the United Kingdom. This is now not necessarily going to be the case for everyone.
Online news portal Politico.eu reports the full story here.
You may also find the latest ECREU (Expat Citizen Rights in EU) Newsletter of interest. Although it does not directly relate to Portugal, it gives us a taster of could be in the pipeline. CLICK HERE.