British regulators have approved the COVID-19 vaccine developed by American drugmaker Pfizer and Germany’s BioNTech for experimental use.

They are the first regulators to give the vaccine the green light.

Trials of the vaccine have shown 95 per cent efficacy.

There is acute interest in how the U.K. plans to implement its biggest immunization program in decades.

It has put in orders for 40 million doses. That’s enough to inoculate 20 million people, since each person gets two doses of the vaccine 21 days apart.

The U.K. only plans to immunize people over age 16. It will have to find other vaccines for all 53 million or so people who are eligible for shots.