COVID-19 vaccine: How exactly does the cold supply chain work?

The Pfizer/BioNTech COVID-19 vaccine approved for use in the UK is manufactured in Belgium and needs to be stored at -70C (-94F) to avoid spoiling before it is administered. The government's Joint Committee on Vaccination and Immunisation (JCVI) has confirmed its priority list for the first phase of the UK's mass vaccine rollout, which will begin early next week. But the prime minister has acknowledged the government faces 'immense logistical challenges' in distributing the vaccine to those who need it over the coming weeks and months. These vaccines will need to be transported from Pfizer's manufacturing plant in Belgium to some of the most distant parts of the British Isles, including the Isle of Arran. Here's how that will work: