France is the route we have run longest, with the steadiest weight of practice behind it.
Portugal is the corridor that has changed most over the last decade. The D7 visa, the NHR tax regime (now reformed), and the slow rediscovery of the Algarve and Silver Coast have made Portugal an arrival country for East London families. We have moved couples to Cascais, retirees to the Algarve, and families to inland Alentejo over the past year alone.
The route from Ilford runs through France and over the western Pyrenees into Galicia, then south. Or it runs through the Channel, down the Atlantic, and across the Spanish border at Badajoz. Coastal versus inland matters; we plan around it. The NIF is your first piece of Portuguese paperwork; everything else flows from it.