Why are 16-year-olds being given a vaccine?

<div>Nicola Sturgeon said she expects that the Joint Committee on Vaccination and Immunisation will soon be recommending that those aged 16 and above will be offered a vaccine. Is this an acceptance that vaccine certificates and Deliveroo discounts aren't enough to reach herd immunity? Isabel Hardman speaks to Katy Balls and James Forsyth.</div>