evidence: An Instagram post claimed that if a UK passport issued before the UK left the EU had additional months for its validity, then those extra months are no longer valid. The post included an example of a passport issued on 21 June 2012, with an expiry date of 21 December 2012; the revised expiry date is 21 June 2012. [...] Before the United Kingdom left the European Union on 31 January 2020, and during the transition period that ended on 31 December 2020, British passports were accepted for travel to all other countries in the European Union regardless of the duration of the passport or the amount of time remaining before the expiry of the passport. [...] - the requirement from most European countries to have at least 3 months left on your passport on the day after you leave