Uk requires electronic travel authorization from february
Starting February 25, UK-bound travelers will need to obtain an Electronic Travel Authorization (ETA) prior to arrival.

Eta mandate aims to strengthen border control
The new requirement aims to reinforce the UK's border management following Brexit. The ETA is not a visa, but rather an obligatory authorization for visitors from countries that don't need a visa for stays under six months.
Spaniards, as well as British and Irish citizens, are exempt from the ETA. Additionally, those transiting through airports like Heathrow or Manchester without crossing the border won't need the authorization.
The UK government recommends avoiding unofficial intermediaries to avoid scams. The ETA application process is available through the UK ETA app or the official GOV.UK website.
Applicants must provide personal data, a valid passport, digital photo, and answers to questions about eligibility and background. A £16 (approximately €18) fee is required for the electronic permit, which is valid for two years or until the traveler's passport expires, whichever comes first.
Most applicants receive a response in minutes, but the UK advises processing the ETA at least three days prior to travel to avoid potential issues. Denied applicants will not be able to appeal and may need to obtain a visa instead.