How UK dual nationals in Europe can renounce British citizenship
British citizens can renounce UK citizenship only if they already hold or will obtain another nationality; renunciation involves fees, formal declarations, and country-specific timing rules.
Travellers being urged to undertake passport checks before the EU EES changes - London Business News | Londonlovesbusiness.com
Check passports now: confirm issue within 10 years, at least three months' validity beyond EU exit, two blank pages, undamaged, and child's five-year validity.