The Guardian claims to have been told such a scheme could come into effect in August and would be based on several factors, including progress of vaccine certificate agreements.
According to The Guardian, the system was discussed in early March as part of plans to restart international travel.
International travel is not expected to restart until 17 May "at the earliest" according to prime minister Boris Johnson’s Covid roadmap, and is yet subject to a report by the Global Travel Taskforce due on 12 April.
