I may have a Yeandle in my family tree. I've been tracing my direct matrileneal line in the Devon/Somerset border area. The line I'm currently working on is Ball from West Anstey, Devon. I have a marriage between John BALE (which I think has been mistranscribed and should be BALL) and Elizabeth Yendle in August 1815 in West Anstey. According to the 1851 census, Elizabeth Ball was from King's Brompton, now Brompton Regis in Somerset. I've checked the Brompton Regis parish registers, which are online, and found an Elizabeth Yeandle, who was baptized in May 1787 and would be the right age for the marriage.
http://www.pbenyon1.plus.com/H_m_w/Brompton_Regis/Index.html