DS1 (nearly 4) hasn't had MMR here in Spain as I wasn't sure. Herd immunity here is very high as usually nobody questions these things. Problem is that we are visiting London this weekend and there has been an outbreak of measles at my brothers school (half brothers 9 and 14) which my DS would love to visit. No time for NHS so have organised a private vaccine for the morning. Will be it be effective straight away - we leave on Friday morning. Will it be owrth al the effort and cost and screaming on his part (how the hell do you keep a 4 y-o calm????!!!)