As we enter 2021 and the Covid-19 pandemic rumbles on, optimism for the coming year relies heavily on successful vaccine rollout. Attention is now increasingly focussed on the practicalities of distribution, which will involve prioritisation and difficult policy decisions. Few argue about those groups right at the top of the list like care home residents, or healthcare staff working in high risk settings. However, an important population is less on the radar: people in prison. There are around 11 million people in prison around the world. Most will be in environments that make social distancing and other measures to reduce transmission, now a routine part of day-to-day community life for most, much more challenging. Such conditions can make prisons vulnerable …