@Eastmum I think it is starting to grow back - but a bit like male-pattern baldness! I can't see the very top of my head but my daughter says it looks like something starting. I never lost everything due to the initial cold caps so a bit hard to tell - and what is there is mostly white so hoping that will change!
Interestingly, there seems to be 2 ways to go with rads - 3 or 5. Not sure why. Another question for the onc but it will have to wait until next week because I'm seeing the Registrar this week and while she's nice and seems competent, I don't have the same confidence in her experience with big questions.