According to Bargain Hunt presenter yesterday auctions were originally held outside - another possible use: Auctioneer's platform.
Peg.
Peg,
An Auctioneer`s or a Preacher`s platform serves the means of both of those seeking to influence the public (he said cynically!).
I think it is probable that it was once the steps leading up to something which was on the wide top area, or plinth.
There is a short pillar on a plinth approached by three steps, at another place called Aston Cross, I think in Cheshire.
Mike