Hammer House of Horror : What Caused the Car To Go Out of Control In Children of the Full Moon?

Was it just the forces of evil in general or did the Woodcutter and/or Mrs. Ardoy have something to do with it.

Not made clear is it?
I was part expecting it to happen again when he went back an came withing some sort of force field radius of the house (Or perhaps I'd just seen 'Village of the damned' too often)

few visible scars

Well I figure that since Sarah said that she felt like the area around the house/woods was where she "expected to be," and later Tom said he's "always known" she would go there (when she was pregnant), and since werewolves are supernatural and everyone other than Tom and Sarah WERE werewolves, that they anticipated her arrival and thus magically got the car to stop right by the property. I could be full of shyt though - that's just IMO. And wasn't THAT one hell of a run-on sentence?!!

I think Mr ardoy may have had something to do with it. What are the chances of 8 peoples cars going out of control around that same location, then ending up at the ardoys for sanctuary?