You can tell by looking at his magnified digits; they consume the screen while he traces along the vellum pages of the Domesday Book, pointing out things like names, numbers and places. His nails are neat, but to the quick. Why does Baxter bite his nails? Is he this worried about telling us, the gentle viewer, about why this Domesday Book was written?
Baxter led the programme along the lines of native English vs foreign Norman invaders. This was hard to conceptualise, as being Norman later became being English, and being English before the Normans meant speaking a language which wasn’t English and not actually calling yourself English. You would have been an Angle. Or a Saxon. Or even just a resident of the shire you had never left because you travel on foot, you don’t go on holiday and you reserve the pony for luxuries, like pulling a plough.