Stephen J. King
This was written at my request because some years ago, I planned to do a book on age of consent. Mr.King wrote this for the projected book. He was a legal researcher. I'd also like to bring your attention to the book called Age of Consent: Young People, Sexuality and Citizenship written by Matthew Waites that talks about this topic very extensively.
Consent of Under-Age Girls to Sexual Encounters with Adults: English Law in a Historical Context by Stephen J. King 1999 (as pdf)