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@Nick_G
So this evening I went to the local car spares place and they had some freezing agent in a can like this stuff by Wurth. I started to explain that I needed to get an ali stem out of a steel tube and they said talk to this guy, pointing to a chap talking on the phone. He turned out to be a rep from Wurth and gave me a free can of Rost Off Ice.
He told me how to use it - spray all over the ali for about 10 seconds, then wait another 20 - 30 seconds and it will come away, no problem. He told me I may need to repeat the process 2 or three times.
I got the stuff home, did exactly as he suggested, and then after the can was empty I sawed the stem just above the tube so I could release it from the rest of the frame.
Next attempt is going to be to using heat.