The UK isn't in the Schengen area, so you need a separate UK visa (Standard Visitor visa), allowing stays of up to 6 months.
- How to apply: fill in the form and pay online on gov.uk, then book an appointment for fingerprints and photo at the visa centre in Hanoi or Ho Chi Minh City.
- Main documents: passport; itinerary; proof of funds (6 months of bank statements, savings); employment letter and leave approval; proof of ties to Vietnam (family, property). Vietnamese documents need English translations.
- Fee for a 6-month visa (from 8 April 2026): GBP 135; optional priority services cost extra.
- Processing: usually about 3 weeks from your biometrics appointment.
- You can apply up to 3 months before travel.
Note: if you visit both mainland Europe and the UK, you need two separate visas: Schengen and UK.