What will be the impact of Brexit if I wish to go to the UK for a short stay, without seeking residence there?
Until 31 December 2020 (unless transition period is extended)
The current situation is maintained. According to European law, you can stay in the United Kingdom for a maximum of 3 months, with no other condition than being in possession of a valid identity card or passport. There is neither a passport nor a visa obligation.
From 1 January 2021 (unless transition period is extended)
Your access to British territory will depend on the content of the future framework governing the future relationship between the EU and the United Kingdom which both parties still have to agree upon, including visa-free transit. At this stage, it is not possible to specify exactly what this framework will look like. The UK has announced that EU citizens will not need a visa for a stay of maximum 6 months. This does not apply for work or study in the UK, for which a visa will have to be requested. The British Home Office made an announcement about that. It is possible that the UK will require EU citizens to carry a valid passport to travel to the UK from 1 January 2021.
Individuals already legally residing in the United Kingdom before the end of the transition period will be able to travel in and out of the country when in possession of a valid identity card or passport. For non-EU family members, a valid passport is required. See question 1 and question 2. With a “pre-settled status” or “settled status” you will have the right to enter and leave the United Kingdom provided you are in possession of a valid identity card or passport until at least 31 December 2025. It is possible that the UK will require other EU citizens to carry a valid passport to travel to the UK from 1 January 2021.