Overseas delegates travelling to the UK are now required to obtain an Electronic Travel Authorisation (ETA). Visitors to the UK, including children, who do not need a visa for short stays in the UK will require permission to travel through an Electronic Travel Authorisation. 

ETAs will be mandatory for travel to the UK and are being introduced in several stages for different nationalities, over the next few months. Please see the link below, where visitors can find official information and apply:

https://www.gov.uk/guidance/apply-for-an-electronic-travel-authorisation-eta

Each individual delegate is responsible for ensuring they have their own correct authorisation to enter the UK. As such, we are not able to provide any individual advice, but would encourage you to direct queries to the officially links above, which also include the option for visitors to web chat with the appropriate authority.