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@Sanddancer
The hacksaw trick does not always work. I had an aliminium post seized in a titanium frame and went with that method for removal.Turns out that it had corroded and bonded to the seat tube all the way round, all the way down. There was no simple rolling up of the post once it was cut through.
In the end it had to be saw away over and over and over and over until there were so many splits sawn down the post it was more like deposits stuck to the walls of an empty seat tube, rather than a stuck post. In the end I had to take it to a proper :BS to have them use a lot of heat and reaming/scraping tools to clean up the inside of the seat tube.