It is quite likely that even these Health Authorities will bring it back again. Young adults who haven't had BCG are given it if they go into occupations at high risk, e.g. nursing and medical students. Anyone spending more than a few weeks in a third world country should also consider it. The brands used in some other countries are less good. The greatest value of BCG vaccination is that it helps protect children from miliary TB and TB meningitis.
Tuberculosis is covered by the Infectious Diseases Act.
If a doctor diagnoses active TB they are legally obliged to fill in a report form. This goes to the local Health Authority. Their Health Visitor interviews the patient and decides if they are likely to be infectious. If so, she finds out who they have been in contact with and decides which of these people are likely to be at risk of having been infected. They are then sent an appointment to go to their local chest clinic.