London: The UK’s new visa-waiver entry system took effect on Wednesday for passengers from dozens more countries, including millions of annual visitors from the United States, Canada and Australia.

The Electronic Travel Authorisation (ETA) scheme — similar to the ESTA system in the United States — requires visitors who do not need a visa to enter Britain to acquire pre-travel authorisation.

Costing £10 ($12.50) and allowing stays of up to six months at a time over two years, it first launched in 2023, with Qatar, before being extended last year to five regional Gulf neighbours.

Now, it has been expanded to include citizens of around 50 more countries and territories, from Argentina, Brazil and New Zealand to Japan, South Korea and Caribbean nations.

With the system kicking in for them on Wednesday, they have been able to apply since last November.

The scheme, aimed at tightening border security, will next be extended to dozens of EU and European countries and territories on April 2.

Citizens covered by the scheme will be able to apply for the new ETA — which is digitally linked to the traveller’s passport — via an app, from March 5.

Around six million people from the US, Canada and Australia visit Britain each year, according to the UK government.

Eligible travellers will need one even if they are just using the UK to connect to an onward flight abroad. ETA also applies to children and babies.

London’s Heathrow Airport has opposed the scheme, saying its rollout has reduced the number of passengers transiting through the UK, and that it makes the country “less competitive” and harms economic growth.

The new requirement does not apply to British and Irish citizens, those with passports from British overseas territories and legal UK residents.

It does not change the requirements for citizens of countries who need a visa to visit Britain, such as Chinese, Ecuadorian and South African travellers.

Previously, most visitors not requiring a visa could arrive at a British airport and proceed through immigration control with their passport.

The new UK entry scheme mirrors the imminent ETIAS scheme for visa-exempt nationals travelling to 30 European countries, including France and Germany, which will cost seven euros ($7.40) and last three years.

The European Commission expects the system — which will apply to around 60 countries, including the US, Canada, Brazil and the UK — to become operational in the middle of this year.