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@vinylvillain
Ok - i have the same problem, but it is easily solved - however it will fuck the paint job
Basically you take it to Mend a Bike in Fulham, and the dude there heats up the seat tube with a torch. Now initially the aluminum expands faster than the steel around it, however as it cools the aluminum shrinks faster, at which point he whips out the seat post, et voila - only problem is that the process strips the paint - he has done a couple for me, and it works a treat.
I might have got the exact metalurgy process wrong, but it does the job
http://www.mend-a-bike.co.uk/