The British government signed a deal on Monday for an extra 40 million doses of the CCP virus vaccine developed by French pharmaceutical firm Valneva.
UK Health Secretary Matt Hancock said he was “so pleased” by the deal.
“This vaccine shows the best of Scottish expertise right at the heart of our UK vaccine endeavour, & demonstrates the strength of our union working together,” he wrote on Twitter.
It will also give the UK future flexibility in case there is a need to revaccinate any part of the population, it said.
Valneva’s COVID-19 vaccine candidate is currently undergoing trials and will need to receive regulatory approval before it is rolled out at the end of the year.
If the jab gets approved by UK regulators, the Livingston facility will be able to produce up to 250 million doses of the vaccine every year for shipment across the UK and around the world.
In addition to the 100 million doses already purchased, the UK government retains options over a further 90 million doses for supply between 2023 and 2025.
By Sunday, nearly 9 million people across the UK had received the first dose of a COVID-19 vaccine.