Getting everyone in a country vaccinated is like watching software updates load: it whizzes along for the first 80% or so and then seems to take forever to finish the rest. Around 80% of the UK adult population has received at least one dose of the vaccine.
To fully vaccinate all adults is going to take a final big push. For it to be successful, those responsible for the vaccine rollout need to ensure that the public are sufficiently capable, have sufficient opportunity, and are sufficiently motivated to take the vaccine.
Capability is about having the knowledge and skills to take up the vaccine. For example, some people might not have had enough information to convince them that the vaccine is safe. They may not know when, where and how to get the vaccine. Or they may not be able to make plans to have the vaccine.
Opportunity is about having the necessary conditions to take up the vaccine. For example, someone might not have the encouragement or social support from family and friends. Or the vaccine might not be available in their region, so they don’t have the opportunity to be immunised.