Vaccination is already part of a national plan. People should be vaccinated at certain ages—I think it is in the first few months, and then in preschool and then at about the age of 14, when they get their booster at school. A couple of things could have happened. Someone may have travelled overseas, had the oral polio vaccine and then excreted it into the system—and it has happened on more than one occasion. On top of that, the important message is: check your records and make sure that you are vaccinated. It is not a matter of trying to get a new vaccine; it is already part of NHS routine. We encourage more people to come forward.