I suspect it is more the home grown mummies who believe they know better than the medical profession, in deciding not to have their children inoculated. Asylum seekers or those immigrating from countries where Measles remains prevalent would I'm sure grasp the opportunity to protect their children.
An aside (sorry Maw) - I wonder if the same people who refuse to immunise their children, are the ones who refuse to have their dogs immunised or treated "with awful chemicals" to prevent fleas and ticks? The facebook dog forums are full of these people, who all know more than the vets, all believe the vets only recommend treatments so they can cheat us out of our cash etc.
I have a simple view, for children (and for dogs) its a social responsibility to the heard. Not all children can have the Measles inoculation, little one's with leukaemia or challenged immune systems for example. If they get Measles they will suffer even more than previously healthy children.
I struggle with the idea that children who are immunised should be excluded from schools or other public places but we do need a public information drive.
Luckygirl - yes, imagine us thinking Boris Johnson got something right!