Having said the above I do wonder whether there might be some missing Keiller connection despite the apparent lack of evidence to support it.
Don't the concrete markers in the Henge itself date from around the same time and belong to the same ‘Egyptian’ Art Deco influence?
Yes and I agree, they are like little Cleo needles. The hints are certainly there but nothing on paper. This is a bit of an itch that can't be scratched.