If you are travelling to the UK from the EU, please take note of the UK Visa requirements: https://www.gov.uk/check-uk-visa 

In case you are travelling via the EU or plan to visit the EU after the conference, please ensure you are familiar with the ETIAS requirements: https://www.etias.info/

Some travelers may need to apply for a UK ETA before their journey. Please visit the UK ETA information page for details and to check your eligibility: https://www.gov.uk/guidance/apply-for-an-electronic-travel-authorisation-eta