Spade, we all have our unique writing styles, perhaps even as unique as fingerprints. While with effort one may be able to mask one’s style temporarily, eventually it comes out.
So I think it is saltofsea, not Andy. There are a couple of features.
He puts each sentence in a separate paragraph, I don’t think any other poster does that. He calls me Rupert, I don’t think any other poster does that (SRM, Sirrup, Sir being the order of the day). Specifically, Andy never called me Rupert.
Also, there is that same sneering, obnoxious, arrogant quality to the posts (though never personally insulting), redolent with spelling mistakes.
So I could be wrong, but I think it is saltofsea.