UK citizens: only British citizens & British Nationals (Overseas) citizens are visa-exempt.
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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.
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.
Yes, drinking water from taps in Japan is safe. For environmental reasons, try to use a refillable water bottle rather than buying bottled water in Japan. Metro train stations have public water fountains, but otherwise these can be hard to find (this is the land of vending machines after all).
Despite Japanese law prohibiting dual or multiple citizenship, it's well known that citizens are often able to quietly retain these statuses due to a lack of official revocation procedure.