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@Alasdair_Irrelevant
soak soak soak in gt 85 or eqivilent for at least a few days. Use a punch or a chisel from the bottom to try to at least get it moving or see if you can jar it loose. Possibly use the blowtorch only on the inside of the headtube to minimise frame damage but you are always gonna risk damaging things a bit when freeing seized parts. Or depending on how the race surface is and how sealed the bearings are dismantle a new one ad bodge it back together with the old one though that is less than ideal. One last though it use something that can wedge against the race from the inside, think like a quill stem, and see if you can convince it to move that way.