Travelled or traveledIn UK English, “travelled” and “traveller” are standard. In US English, “traveled” and “traveler” are more common.
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The same goes for all versions of Traveler/Traveller, and Traveled/Travelled: One “L” for countries that use American spelling, and two for places that embrace British English writing conventions.
You can visit the UK as a Standard Visitor for tourism, business, study (courses up to 6 months) and other permitted activities. You can usually stay in the UK for up to 6 months. You might be able to apply to stay for longer in certain circumstances, for example to get medical treatment.