Thanks Chris, and it was indeed moving across Kent to a new home, with Chris Stanley escorting:
https://www.flickr.com/photos/rw3-497alh/55213836333/, though I didn't ask where this Preserved vehicle is going,
I now know better than
that.
I did however discover that for one weekend at least, this spot suddenly seemed to be a good spot to unexpectedly encounter oldies!, as less that 24 hours later I captured an ex Yorkshire Rider/First Group Buses Volvo L305PWR now in Non PCV Use as a PayBus, passing the Docks Roundabout.