Citizens of the following countries and territories are visa-exempt for stays in the UK of up to 6 months (or 3 months if they enter from the Republic of Ireland) as long as they fulfil all of the following criteria:[1][2]
they do not work during their stay in the UK
they must not register a marriage or register a civil partnership during their stay in the UK
they can present evidence of sufficient money to fund their stay in the UK (if requested by the border inspection officer)
they intend to leave the UK at the end of their visit and can meet the cost of the return/onward journey
they have completed a landing card and submitted it at passport control unless in direct transit to a destination outside the Common Travel Area
if under the age of 18, they can demonstrate evidence of suitable care arrangements and parental (or guardian's) consent for their stay in the UK[3]
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↑ 3.03.1The visa waivers granted by the European Union, the United Kingdom and Ireland to Taiwan passport holders have not altered the European Union member states' non-recognition of Taiwan as a sovereign country. For this reason, Taiwan is listed in Annex II by the European Commission under the heading "entities and territorial authorities that are not recognised as states by at least one member state", by Bulgaria as "China, Taipei" (mfa.bg) and by Romania under the heading "Special Administrative Regions of the People's Republic of China"(mae.ro).
↑Only for holders with their personal ID numbers stipulated in their respective passports.
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↑Holy See Service & Emergency passport holders only.[2]