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@petertreglown
a late addition too this, last resort/method at the shop I worked at was to cut the post 3 cm above seat tube and use a long hacksaw blade that was bolted to a length of strip steel this was used to cut a vertical cut down the inside of the seat tube, with care you would not cut the frame...when the cut was through ( mostly ) it would be possible to crush the seat post and remove it. This was done if all the usual soaking with chemicals ( wurth rost- off ) and gentle blow -torching had failed. We would'nt give up!