Here you can find information on what you need for your visa application: https://visaguide.world/europe/uk-visa/requirements/
Please note, all ECER participants with fully paid fees (ECER participant registration will start on 1 April) can access an invitation letter via their user accounts in Conftool. For that, you have to confirm in your user account details that you need such a letter. You can re-enter your user account details via Edit User Account Details on the overview page of your user account.
We recommend that participants who need a visa start the process of applying as early as possible.
EU, EEA and Swiss citizens can travel to the UK for holidays or short trips without needing a visa. You can cross the UK border using a valid passport which should be valid for the whole time you are in the UK.
You cannot use an EU, EEA or Swiss national ID card to enter the UK.