Most people are required to apply for prior entry clearance (Leave to Enter) at a visa application centre abroad, which may be provided as a stamp, often called a vignette, in the person’s passport.
Mae'n ofynnol i'r rhan fwyaf o bobl wneud cais am ganiatâd mynediad ymlaen llaw (Caniatâd i Ddod i Mewn) mewn canolfan ymgeisio am fisa dramor.