It seems Sutcliffes wife was present at most of the 9 interviews. And helped confirm his false alibi's over several years.
Whether she did this deliberatly or not, I don't know. She may have been unsure of the dates but wanted to believe her husband was innocent. So just backed up Sutcliffe's lies.
I wonder what she felt when the photofit was released to the public which looked just like Sutcliffe & it was said the ripper had a gap in his teeth.
Julie getting crucified for staying loyal to Bamber for only 20 days seems very unfair.