Is it safe to go on holiday abroad? The important four factors to consider before booking Updated: 16:00, 25 May 2021 BRITS opting for a holiday abroad this year will have to think carefully where they go due to Covid. While there are just 12 countries on the UK's green list which allows restriction-free travel right now, families planning ahead may have to opt for a different destination this year. 7 A holiday abroad is likely to be very different this yearCredit: Reuters Portugal is one of the few holiday destinations on the green list which won't require a quarantine when returning to the UK, which saw thousands of Brits flock to the country last week.