The online booking system has been updated to allow booster bookings for severely immunosuppressed people.
There are around 400,000 people who are severely immunosuppressed who are eligible for a fourth jab – at least three months on from their third dose – and are able to book a month in advance of that.
This group includes people having treatment for conditions such as cancer or those with long-term chronic conditions where their condition puts them at greater risk if they were to get COVID.
Previously, the NHS contacted people who are eligible for additional doses of the vaccine and GPs and their clinicians were also asked to identify and invite them for their vaccinations.
People who are severely immunosuppressed are also able to access walk-ins across the country, following instructions on the walk-in finder or book a fourth dose appointment online to get protected.
The change to the online service will make it even easier for people to plan and book their top up vaccinations.
So far, more than nine out of ten of those who are severely immunosuppressed have had a third COVID-19 vaccination.
You can read the full press release on the NHS England website.