It is possible to travel with less than 6 months on your passport, depending on which country you are travelling to. To travel to the UK, your passport will need to be valid for the entire duration of your trip.
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Multiple entry rules for UK visitorsEqually, a standard visitor visa, provided that this is not endorsed as 'single' or 'dual-entry', can be used multiple times. This means that the visa-holder can depart and re-enter the UK as many times as they want within the visa's validity period, up to a maximum of 6 months.
Generally, most visas are valid for up to six months before they expire. However, if your visa is a nonimmigrant visa (such as a tourist or business visitor's visa), then you may be able to travel up until the expiration date listed on your passport.