The destination of Frindsbury suggests somewhere around the Sans Pareil, at the top of Frindsbury Hill.
I have a North Kent timetable from 1970 which shows some short workings on the 19 group with Frindsbury as a last timing point, albeit with an extension to Wainscott, Holly Road (which is about as far from the Sans Pareil in the opposite direction as this, and for which Wainscott would be a better choice of destination in my opinion) in the morning peaks. Given timings, though, they look to be for Wainscott Primary School, so wouldn't have turned here.
Chris