The Home Office publishes a list of nationals who must apply for a visa before travelling to the UK. Click here to access the visa national list. All other nationalities can usually seek entry as a Visitor on arrival to the UK; please see the link above for exceptions stipulated by the Home Office. If you’re planning to obtain a visitor visa on arrival, you must make sure you’re eligible before travelling and you’ll need to have the required documentation ready to present to border enforcement officers. With this in mind, you may still wish to seek legal advice to make sure that you have everything you need for smooth entry into the UK.