“As many as 50,000 British holidaymakers have been affected.” https://www.independent.co.uk/travel/news-and-advice/sicily-catania-airport-flights-brexit-b2382729.html
“As of 9am on Good Friday, ferry operator DFDS said traffic was still ‘free-flowing through check-in’ at Dover, but warned…
“Fingerprint checks set to be introduced on the EU border could significantly disrupt holidaymakers, industry experts have warned.” https://www.thenational.scot/news/23045924.eu-fingerprint-checks-travel-chaos-expected-next-summer-snp-blame-brexit/