[adrianb]

> For 2021, national tourist board Visit Britain has forecast that visitor numbers will be lower even than in 2020, when travel restrictions were at their highest.

Not sure how they evaluated the travel restrictions, but in 2020 there were travel corridors between many European countries including the UK, while for most of 2021 to enter the UK there were required PCR tests (usually 3) and home quarantine. 2021 restrictions definitely felt more strict, at least in the summer.

Restrictions for arrivals were only lifted for the vaccinated in the autumn.