Erica - I often come to this site and it is so good to take time out of the day to read various postings, and to know that my feelings on a whole variety of topics are shared by many people. I too found my birth parents (now married to each other) so I too have full siblings. I clicked on this thread as its title interested me, and read your message, and thought "yep I can relate to her"!!! I read through all the replies and then went back to your original message and saw your e-mail address and amazingly your name rings a bell, I think we may have gone to the same school located in Herts, but were just a year apart.
I would be happy to participate in your research...if it is not too late. I will e-mail you my details.