You must have a valid passport and an onward/return ticket for tourist/business visa free stays of up to 90 days. Your passport must be valid for the entire time you are staying in Japan. You cannot work on a 90-day visa free entry.
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Where Can UK Passport Holders Travel Without a Visa?
Singapore has taken first place on the latest Henley Passport Index 2023 rankings. Singaporeans enjoy visa-free access to 192 travel destinations out of 227 worldwide. With Japan falling to third place, three European countries tie in second place: Germany, Italy and Spain with visa-free access to 190 destinations.