Assumed to be an immature moth but not sure. The images show a couple of smaller passengers that were along for the ride. In the first image there’s a small light brown insect close to the head end, possibly a parasite. It’s also shown in closer detail the final image. There was also a red and black coloured mite seen in the third and fourth images that wandered away from the immature moth as it was being photographed.
Thanks @ibaird and @WendyEM for the identification and comments. With regards to 'Great fleas have little fleas upon their backs' not sure if sighting 4446751 illustrates the point.... Tim