Information for London
EU, EEA and Swiss nationals do not require a visa, and can enter London with either a valid national identity card or passport.
Nationals of 56 countries but do not require a visa for travel purpose for up to 6 months.
Nationals of Oman, Qatar and the United Arab Emirates may apply for an Electronic Visa Waiver (EVA), which is valid for tourism and study, and stay for up to 6 months.
Nationals of China and India who have a valid Irish Short-stay Visa and endorsed with "BIVS" and who have cleared immigration in Ireland can visit the UK visa-free until their current permission to enter/remain in Ireland expires.