Hi, my name is Sarah, I'm the daughter of Martin Richard Blackett. I can't help you with your search for Carol but it's interesting to know that I have family I've never even met. I've always known about Martin & Gwen as they are my half brother & sister but I've never known much about them as I come from my dads second marriage & he never had a relationship with them.
Anyway it would be nice to here from you, please get in touch x