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I've had the same issue twice and resolved it with caustic soda!!
Make sure you tape the seatpost up as water tight as you can, like really water tight. Then pour the solution through the bb into the seat tube.
After about 24 hours it'll either be disolved completely or enough to free it up and remove it!
Josh
LBS managed to free the stem and bottom bracket.
Seat post remain very stuck.
Weekend plans sorted.