I was tested for immunity to rubella at my booking in test before having DS (would be 2 years ago next month) and told I wasn't immune and had to be immunised after having him.
I ended up changing hospitals to have him in Scotland and was told I was immune to rubella!!
My dad isn't sure if I had the MMR or not (was born 88?), I'm suspecting maybe I had the first dose and not the second hence why I do not have enough immunity according to London hospital but maybe enough for different guidlines in a Scottish one?