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@clubman
If the penetrating oil doesn't work:
Remove bottom bracket bearing, turn frame upside down, plug any holes and fill seat tube with cheap vinegar. Leave for a couple of days, then try it.
If this fails ( although I don't expect that it will) an oxy-acetylene flame will destroy the ali seat post long before it harms the steel frame. This will damage the paint, but perhaps it's due for a respray in any case.