Am also catching up on "3rd Stone". In issue 35 an article by R.W.Morell is based on the idea that a large chunk of oak found by the Duke of Northumberland's men is the remains (now lost) of a world pillar sticking through the centre of the mound. The comparison he makes is with pre-Buddhist stupas (for a moment I thought of the Egyptian ben-ben mound, but that is a different case, no Irminsul equivalent). Does anyone here know anything further ? If it were true, unless Silbury is completely unique you would expect similar poles to have been found elsewhere in Britain. Were there ?