Dave Lloyd with a bit of work needed

I think this is a Dave Lloys with a LOT of work needed!

If the penetrating oil doesn't work:

Remove bottom bracket bearing, turn frame upside down, plug any holes and fill seat tube with cheap vinegar. Leave for a couple of days, then try it.

Thanks for the vinegar tip, was thinking of coke but I guess vinegar is more acidic and should work better. Frame is currently upside down with the seat tube filled with plusgas.

If Paint is no issue...heat...clamp the seat post in vice...if you can get butane on it to freeze it first (remember to be well ventilated...and a blow torch....;D

or hacksaw blade...be patient, have a spliff...and saw away...2 hours later (if you are unlucky...) it's out..

Rather work with dry ice and hot water than butane and blow torch :) Hack saw already in the tool box for the worse case scenario.

Remember ali expands much more than steel when heated, so just heating the steel tube will only jam the seat pin in more tightly. This principle works well the other way round - for example when removing a ali crank from a steel BB spindle.

However the aluminium will just collapse if given enough heat, and as mentioned above, this happens before the brass in the lugs starts to melt. This is perhaps not a job for some one who has never previously handled oxy-acetylene.

Yep, had this noted down and likewise alu contracts more when chilled hence I am using the dry ice + hot water treatment. Dry ice in a bucket and put the bit of post sticking out into it and some crushed bits of dry ice into the seat tube, leave for an hour or two then clamp seatpost on vice and pour hot water on seat tube and a quick twist. Hopefully this works!