Can I travel back to UK the day my passport expires?
To enter the United Kingdom, your passport must be valid for the entire duration of your planned stay.
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If your passport's time is almost up, don't wait — start the renewal process now. You can't travel while your renewal application is being processed, and you need to make sure your travel documents are valid for at least six months past the dates of any planned international trips.
As a general rule, passports must be valid for six months beyond the date the traveler will exit the United States. However, the United States has signed agreements with a number of countries to waive this requirement.
Visitors traveling to the U.S. are required to be in possession of passports that are valid for six months beyond the period of their intended stay in the U.S. Citizens of the countries listed below are exempt from the six- month rule and need only have a passport valid for their intended period of stay.
Passport valid for travel to the United States – Your passport must be valid for at least six months beyond your period of stay in the United States (unless exempt by country-specific agreements). Each individual who needs a visa must submit a separate application, including any family members listed in your passport.