nice one wideford, I missed what you were saying here first time around, sorry! Here's a quote, though, from that article you link to, which suggests that Pol's stump was a law-making place in the style of the Anglo-Saxon Moots and Hundreds:
"The choice of Pol's Stump, a stone or cross, as a moot for the Londoners [47] may go back to this phase of purely ritual occupation." (from the final paragraph of the article)