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@Seak
I tried using caustic soda, having previously tried GT85, Plusgas and other lubricating agents [snarf!]. After several weeks of using a super-saturated solution (i.e. so strong that it wasn't disolving any more) I gave up and sent my frame to Mercian, who nuked the seatpost out.
I think once I worked out how much it had cost for the various lubricants, two packets of caustic soda, hacksaw blades for the 'drop a blade down the open seatpost' trick, etc... getting it done professionally was cheaper (albeit it wounding to my DIY ego).