UK: Passengers will now need to fill a form to prove that their trip is approved

Those traveling abroad from the United Kingdom will now need to fill a new form to board a flight, to prove that their trip is allowed under the country's stay-at-home restrictions.

For this, travellers will be required to download a travel declaration form online, and sign it before boarding their flight. Further, they will have to bring either the electronic copy or the form with them, which will be checked before boarding or at the check-in counter. Those without proper paperwork, might be turned away from the airport.
All these travellers will have to inform everything regarding their travel, i.e., reason for taking the trip, which will have to be legally permitted, like education, work, wedding, or medical purposes etc. Those found without the form might have to pay a $277 fine.
Also, travellers flying from abroad to the United Kingdom will also be required to either get tested before arrival and undergo quarantine before undergoing the second test, or undergo quarantine in a hotel, depending on where they are coming from. In this case also, those found not abiding the rules of hotel quarantine, will have to face 10 years in prison as punishment.
Reportedly, as the UK is planning to slowly lift the country’s lockdown step by step, UK Prime Minister Boris Johnson stated that international travel won't resume until at least May 17. However, as per the reports, outdoor dining at pubs and restaurants is expected to resume in April.

While there is still some time before the United Kingdom opens its borders for tourism again, the country is pushing for developing an internationally recognised vaccine passport in a move to help boost the struggling travel sector when restrictions are lifted.