Holidaymakers can use UK passports on electronic passport gates at major international airports in Portugal and Spain, although they are still urged to get their passports physically stamped upon entry.
Before Brexit was completed, UK passport holders could use e-gates to enter EU countries, which is often quicker than queuing up for a manned desk. Most EU countries now no longer allow British visitors to use e-gates, as they are mostly designed for EU/EEA and Swiss passports. The UK is no longer in the EU.
But Spain and Portugal have updated e-gates at international airports, which accept UK passports. Although using them for a holiday is not as straightforward as before Brexit.