More than 70 British lawmakers have signalled their opposition to the introduction of so-called vaccine passports that the government is considering bringing in to help to open the economy as it starts lifting COVID-19 lockdown restrictions.

The government is reviewing the idea of asking people to show proof of a COVID-19 vaccination to access crowded spaces such as pubs or sports events, with Prime Minister Boris Johnson having already said that a certificate is likely to be needed for international travel.

The Daily Telegraph newspaper reported on Saturday that trials of COVID passports would begin within weeks during pilots at major sports events and possibly a music awards ceremony in the next two months to assess their impact.

On Friday Johnson said that a combination of immunity factors - if people have had the disease, a vaccination or had a COVID-19 test - would give businesses confidence.