Due to the current outbreak, a national call/recall will be initiated throughout Feb/March 2024. Practices should expect to receive enquiries from patients and should check immunisation records and if clinically appropriate, administer the vaccination.
In London and some parts of the Midlands, where the risk of measles outbreaks is currently high, NHS England plans to extend the target age cohorts so that children and young adults aged 6-25 years will receive MMR vaccination reminders.
https://www.england.nhs.uk/long-read/confirmation-of-national-vaccination-and-immunisation-catch-up-campaign-for-2023-24/