http://www.stonepages.com/england/silburyhill.html
Moses B.Cotworth, not Cosworth
he was into it being a sundial - not the same thing at all, but still interesting idea about a girt big lump of wood sticking out of it
maybe I'll write the article up for you, it's in an "obscure journal" I've had kicking around for ages ...
I've got this other one Edward Nye, and it reckons that Noah ran a huge communications network from the top of Silbury, so don't go trusting *my* library ...
I've the attention span of a gnat ...
RG