To those of you staying you won’t be allowing your children to have it, can I just point out it’ll be their decision not yours?
Older children (and 12-15 count as older) can consent or withhold consent for vaccinations and override your concerns in these things. Same holds true for anyone planning to match their child down to have it against their wishes - it’s very much their choice not yours.
So if you have strong views either way then I hope your children share them.
Interesting views locally - children in one school will be queuing up to take it whilst children in another are all deeply suspicious of it apparently.