There is no policy to let herd immunity just happen. It can only really happen with a vaccine. It is a population state where those who can't or haven't been vaccinated are less likely to get the disease.
Quote:
Some people in the community rely on herd immunity to protect them. These groups are particularly vulnerable to disease, but often cannot safely receive vaccines: - People without a fully-working immune system, including those without a working spleen
- People on chemotherapy treatment whose immune system is weakened
- People with HIV
- Newborn babies who are too young to be vaccinated
- Elderly people
- Many of those who are very ill in hospital
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Those people need herd immunity to exist or they are at constant risk. I think that covers most of the 1.5m people who are currently "shielding" from the virus.