No UK citizens do not need a visa to go to Singapore just like Singaporeans do not need a visa to enter UK
Yes, UK citizens need a visa to travel to Mexico for tourism or business purposes.
Yes, UK citizens need a visa to travel to Dubai.
Yes, most non-UK citizens need a visa to enter the United Kingdom.
No, US citizens do not need a transit visa for the UK if they are passing through the country on their way to another destination.
Yes, they do.
Yes, US citizens need a visa to travel to the UK for tourism or business purposes.
No, they are European citizens.
Yes, green card holders need a transit visa for the UK if they are not citizens of a country that is exempt from the UK transit visa requirement.
No, Serbian citizens doesn't need visa for Schengen countries, but they need visa for UK and Ireland.
As of January 2021, EU citizens do need a visa to enter the UK for stays longer than 6 months. Short-term visits for tourism or business purposes do not require a visa, but longer stays do.
Not necessary for United Kingdom citizens.
No, US citizens cannot work in the UK without a visa.