Yup - Andrew Chumbley, the founder and first Magister of the Cultus Sabbati, was an initiate of a distinctly non-Wiccan English tradition of witchcraft. Very specifically, he mentions that his tradition has its roots in Essex and surrounding areas.
The Toad Rite is fascinating. I've read the book One and find it very beautifully written. You may already know that the Society of the Horseman's Word is said to have used this rite as a sort of initiation.
I've read a lot of discussions around this rite and I've always wondered what is REALLY behind this. Is the rite actually performed as written or is it more metaphorical for a process of obtaining the toad's power of influence? I've noticed that most Traditional Witches want to see it as an actual rite that is performed, with the struggle with the Devil and everything else, whereas I see the rite as a mask for another process.