In addition to a passport to go to England you will also have to pay for and apply for an electronic ETA visa
Brexit continues to heavily affect the world of travel, especially for us Europeans who had become accustomed to traveling [...]

Brexit continues to weigh heavily on the world of travel, especially for us Europeans who had become accustomed to traveling around the old continent almost as if on the doorstep, just with our ID card always in our pocket, but hardly ever having to show it. Things have started to change, however, but complicit in the pandemic the effects have been seen in stages.
ETIAS will come to Europe.
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Last year triggered the requirement to have a passport to make a weekend trip to London or a hop to Scotland for a rugby game now comes the second step: the need for an electronic visa. Something similar to the ESTA required to go to the U.S., which also requires you to pay about 20$, but similar instruments exist for passengers bound for Canada, South Korea or New Zealand just to name a few.
Europe will also have its own dedicated to those arriving from outside the Schengen area. In recent days, the European Commission had decided to postpone the implementation of the European Travel Information Authorization System (ETIAS). ETIAS was previously scheduled to be launched in May 2023, but it has been delayed until November 2023, but the launch of ETIAS will most likely not see the light of day until 2024.
ETA required to go to Britain
It will also be mandatory at the border of the Great Britain and will be called Eta (Electronic Travel Authorization), a name similar to many others since the Korean one is called K-eta and a similar procedure. You will need to fill out a form before you leave and pay a fee, received the ok you will be able to board to the island and enter (almost) without any problems.
It is not yet clear when it will go into effect and the fee that will have to be paid to obtain it is not yet known, but to see it in action will be a short wait since travelers from outside Europe will have to have ETAs by the end of the year in order to travel to Britain.
In conclusion
Let's just hope that Brexit doesn't take away free roaming when traveling in the UK, something that was obtained from the European Union and seems a given to us today, I say this because British travelers on the other hand is one of the benefits they lost almost immediately upon leaving Europe.