Individuals undertaking an element of research at PhD in certain sensitive subjects must obtain an Academic Technology Approval Scheme (ATAS) certificate from the Foreign, Commonwealth and Development Office (FCDO) prior to commencing their visit.
Failure to obtain a required ATAS certificate (when required) will prevent the visit from commencing. Applying in good time and before travelling to the UK is strongly recommended.
The Government has fully implemented the Electronic Travel Authorisation (ETA), giving nationals who can visit the UK without applying for a visa in advance (‘non visa nationals’) a digital permission to travel to the UK.