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@Tonts
Long overdue update: The seatpost is out!
Heated it up with a heat gun then cooled it with GT85/water. Did this periodically over a long-ish period of time, then forgot about it for ages. Today I tried putting the seatpost in the vice and yanking the headtube end. Started to move fairly easily but applying a necessary force to move it out was a slow process. Got about half of it out, in the end a chap from work who's about 50 times stronger then me put a stilson wrench on it and got the last half out. Lots of corrosion and electrolysis on the post.
Have waxoyled the inside of the seat tube and will give it a good clean out at some point.