S
SammyInnit
Nothing will change with foreign terrorists regarding boarders unless nobody is allowed in ever again. Am sorry to say. It is all down to intelligence gathering... Nobody arrives at our customs and declares that they are terrorists, so without intelligence it's going to be flipping hard to stop anyone when talking about boarders. You do know that everyone, including people from the EU or traveling from an EU country have to stop and show their passports/identity checked right? It's not like people can walk right in.
If you are an EU national , you do not need to show your national ID card or passport when you are travelling from one border-free Schengen EU country to another.
The premise being if you are an EU national but it's contradictory because you don't have to prove it. This is the issue we see with boats arriving from Africa and landing at Italy/Greece - once they're on soil under EU Schengen jurisdiction they don't need a passport to move from one country to another.
The UK is fortunate enough to not be part of the Schengen area but that doesn't mean anyone in the EU could not illegitimately acquire the appropriate documents to enter the UK.
https://europa.eu/youreurope/citizens/travel/entry-exit/eu-citizen/index_en.htm