VISITING THE UK
If you are travelling to the conference from abroad, you will likely need to apply for an Electronic Travel Authorisation (ETA) for permission to travel to the UK. This costs £10, and application information is available here: https://www.gov.uk/guidance/apply-for-an-electronic-travel-authorisation-eta. Please note: the list of nationalities that are required to obtain an ETA to travel to the UK is significantly expanding in early 2025. If you have previously travelled to the UK without requiring an ETA, this may have changed by July 2025. See here for a list of nationalities, and the dates when new ETA requirements are coming into effect: https://www.gov.uk/guidance/check-when-you-can-get-an-electronic-travel-authorisation-eta.
For other nationalities, it may be necessary to apply for a visa. Information is available here: https://www.gov.uk/check-uk-visa.